Coakham Ride used to be on the Pevensy levels which was great fun and in aid of Brest Cancer (one of the lady masters had it) Barons Grange hunting on xmas eve was always great - I went most years from age 11 onwards on particularly memorable year with Nic was the year he went as a teletubby.... had to blind fold horse to let him get on!! there are some lovely hedges round there though not sure if you'll be directed to jump them in "cold blood"?