Hutleys Leisure Caravan Parks at St. Osyth. Overlooking the beaches and marshlands of the river Colne Estuary, famous for its oyster fishing and Thames Sailing Barges. Hutleys superb location next to a beach has something for everyone. Clean sandy bays, accessible area for boat, windsurf and jetski launching, one mile of saltings perfect for bird watching and an area for naturists.