Back in January when I was on my honeymoon, we stayed at a wonderful eco-friendly place on the island of Bohol in the Philippines. They use goats to keep the place they have carved out of the jungle tidy and free of weeds. After seeing how little impact this involves, I was duly impressed; it looks like a tropical garden:

http://bit.ly/HzqRF http://bit.ly/glO6K

Nuts Huts, Loboc, Bohol Philippines: http://www.nutshuts.com/

N.B. I'm in no way affiliated with them, but it's a great place to visit and relax.