A competent mathematician, with a knowledge of architecture and hydraulics, Parkyns was his own architect and engineer. He erected a free school and almshouses in Bunny, and he also restored the large chancel of
St Mary's Church, Bunny, gave it bells, and built a vicarage. He rebuilt all the farmhouses, planted the hills with woods, founded an
aqueduct and a decoy, and erected a tower at
Bunny Hall. Parkyns constructed manor-houses at Bunny, East Leake, and Highfield Grange,
Costock: the one at East Leake has not survived. He built also a park wall three miles in length, the first of the kind in England supported wholly on arches. ==Wrestling==