I saw both positive and negative when I was in Belize. On one hand it brought in a lot of money to the country, on the other in order to make accommodations and larger hotels and such like Americans want, large foreign(often American) companies destroy a lot of natural habitat or in some case ruins that are thousands of years old.
There is a cave in Belize known as Actun Tunichil Muknal. It goes about 3 miles deep through winding passages and tight areas, sometimes you need to swim under rocks to get to the next area of the cave. Once you get to the back there are some bodies that were sacraficed thousands of years ago and because of the ecosystem of the cave they have calcified and give a crystalline appearance. . While I was down there a tourist dropped his camera directly onto the skull of one of these bodies, shattering the thousand year old skull. From that point on cameras were not allowed in the cave but honestly I believe the whole thing should just be shut to the public.