Assuming that you're a competent shooter looking for a shoot, try to find a farm with a copse in the middle, rabbits love to dig in woodlands and raid the surrounding fields every night. Woodlands are often slightly higher than the surrounding land, the trees stop soil erosion, and rabbits love well drained soil. Who wants to sleep in a puddle ?

Also, fields near dykes and raised railway lines will be full of bunnies for the same reason.