in Frederiksted
Frederiksted maintains its
Victorian era architecture and original seven-street-by-seven-street design, and has several historic structures. Among them are St. Patrick's Catholic Church, built in the 1840s, and its primary school, the Customs House; the 19th-century Apothecary; and many other buildings, some of which hurricanes have transformed into scenic ruins. Frederiksted operates at a more relaxed pace than most of the island, and is more lively during
Carnival in January and whenever visiting cruise ships are in port.
Salt River Bay National Historical Park and Ecological Preserve contains the only known site where members of a Columbus expedition set foot on what is now U.S. territory. It also preserves upland watersheds, mangrove forests, and estuarine and marine environments that support threatened and endangered species. The site is marked by Fort Salé, an earthworks fortification from French occupation, dating to around 1617. The park preserves prehistoric and colonial-era archeological sites, including the Caribbean's only extant ball court. This is one of two sites on the island for
bioluminescent bays (the other being Altona Lagoon).
Fort Christiansværn, built in 1749, and other buildings are maintained by the
National Park Service as the
Christiansted National Historic Site.
Buck Island Reef National Monument preserves a island just north of St. Croix and the surrounding reefs. It is a popular destination for snorkelers. Buck Island maintains a U.S. Coast Guard weather station and is home to a student-monitored lemon shark breeding ground. Green Cay (pronounced green key) is a small island southwest of Buck Island managed by the U.S. Fish and Wildlife Service. It hosts a nearby reef popular among scuba divers and snorkelers, Tamarind Reef. The farmer's market (1 Estate, Kingshill, 00850, St. Croix) offers local fruit and vegetables, as well as plants, local food, and juice. The outdoor vendors open every Saturday from 6 a.m. to 12 p.m., sometimes longer. The farmer's market is open year-round. The
St. Croix National Heritage Area was established by the National Heritage Area Act in 2022 to help preserve and promote historic and cultural sites across the island.
Scuba diving, snorkeling, and watersports The waters surrounding St. Croix are warm year-round, with temperatures ranging from – , making it a popular destination for watersports including scuba diving, snorkeling, kayaking, paddleboarding, surfing, kite surfing, parasailing, jet skiing, fishing, and sailing. Two of the island's most popular underwater sites for scuba divers are the
Frederiksted Pier and the drop-off into deep water at
Salt River Bay National Historical Park and Ecological Preserve.
Frederiksted is known for reef diving and access to wreck diving. The island's western side has calm waters that allow snorkeling with access from the beach. Paddleboarding is popular near Frederiksted for the same reason. The Frederiksted Pier attracts scuba divers and snorkelers, as well as those who simply jump off it. The shallow water and sandy bottom around the pier are ideal for
recreational diving by novice scuba divers in
PADI Discover Scuba Diving programs (also called resort diving), for extended shore diving,
night diving, and for
underwater photography, especially of its abundant
seahorse population. A few hundred meters off the northern coast of the island, from Salt River to Cane Bay, the bottom drops suddenly into a deep trench, where coral reefs, abundant tropical fish, and migrant sea turtles may be observed. Kayaking is also popular in the Salt River.
Christiansted, a short distance from Buck Island and Green Cay, is a former capital of the Danish West Indies. It lies just east of the northern underwater drop-off and is protected by a reef.
Bioluminescent bays There are two
bioluminescent bays or bio bays on St. Croix. The most widely known and visited is at
Salt River Bay National Historical Park and Ecological Preserve. The other is at Altona Lagoon. Bio bays are extremely rare; only seven year-round lagoons are known to exist in the Caribbean. A combination of factors creates the necessary conditions for bioluminescence:
red mangrove trees surround the water (the organisms have been related to mangrove forest, although mangrove is not necessarily associated with this species). A study at the Salt River bio bay is being conducted by faculty and students from the University of South Carolina, the University of North Carolina-Wilmington, and the University of the Virgin Islands. Their research focuses on analyzing quality and nutrient composition of the water, the distribution of a microorganism, the
dinoflagellate Pyrodinium bahamense, that glows when the water is disturbed, and the abundance of "cysts", dormant dinoflagellates embedded in the sea floor. A concurrent complementary study is being undertaken by the St. Croix Environmental Association in conjunction with Scripps Institution of Oceanography. It focuses on counting the photon density of the phenomenon over time and in various weather conditions. Water quality and taxonomic analysis from both studies will be shared and correlated to create one of the most thorough investigations of year-round bioluminescent bays to date. St. Croix's two bio bays have very different characteristics. The one at Altona Lagoon is large but shallow, allowing one to see various marine life swimming and agitating the water, lighting it up. The bio bay at Salt River is smaller but deeper than Altona Lagoon. Because of its depth, it is also home to a second form of bioluminescence,
Ctenophora, or comb-jellies, that are not found at Altona Lagoon. A third bioluminescent organism is also found in Salt River. A species of marine
Odontosyllis fireworm performs its brilliant green mating ritual within 57 hours after the full moon, females rising to the surface and leaving a luminescent green puddle for the males to race through, fertilizing the eggs.
Protected areas •
Buck Island Reef National Monument, managed by the National Park Service (a federal agency) •
Christiansted National Historic Site, managed by the National Park Service (a federal agency) •
Green Cay National Wildlife Refuge, managed by the US Fish and Wildlife Service (a federal agency) •
Salt River Bay National Historical Park and Ecological Preserve, co-managed by the Territory of the Virgin Islands and the National Park Service (a federal agency) •
Sandy Point National Wildlife Refuge, managed by the US Fish and Wildlife Service (a federal agency) •
Point Udall •
St. Croix East End Marine Park: managed by the Government of the Virgin Islands through the Department of Planning and Natural Resources' Division of Coastal Zone Management File:Christiansted, US Virgin Islands, from Recovery Hill.jpg|Christiansted, looking north. File:Csted2.jpg|Downtown Christiansted and harbor File:Csted3.jpg|Old Danish Customs House, Christiansted File:2008-01-27 Grapetree Bay St. Croix USVI.jpg|East End File:2008-01-28 Tague Bay St. Croix.jpg|East End File:2008-01-27 Teague Bay Beach St. Croix USVI.jpg|Teague Bay Beach File:2008-03-30 Canegarden Bay St. Croix USVI.jpg|Canegarden Bay Beach File:2008-07-17 St. George Village Botanical Gardens St. Croix USVI.jpg|St. George Village Botanical Gardens File:Canebay1.jpg|Scuba diver and sponges, Cane Bay wall File:Canebay2.jpg|Scuba diver and sponges, Cane Bay wall == Notable people ==