Earlier today, a link for vegvoyages.com appeared on the googleads at the top of the front page. If you google veggie tours, there's a few around.
But I like the idea of fruit-orientated tours

like a banana tour to the Carribbean

Some tours are quite expensive: you end up spending £600+ to travel by bus and camp in a tent

you could really cut costs if you bought your own land and set up an eco-resort or kibbutz? Then gap-year students and travellers on a budget could afford to stay, without eroding your profit margin
Some farms near here will even give you cheap accommodation, or let you camp nearby, if you work picking the fruit - quite a few people do this to have a "working holiday." However, this might upset local people if jobs are scarse...