I was thinking similar to Alister but it depends on where you are, also, Lavender is a big money growing crop in Australia, either grow something with a high value or...you could always rent it out to those people who love to ride around dressed as a horse and pulling some one!!! Make it an assault course or training ground for humans, if you make it hilly and dippy you could have off road bike track, gun clay pigeon range or archery, and Oh, a ridding school maybe good if you are near bridle paths!!!!!