We don't get independent visitors all that often at the field station I currently work at, because it is not in a super popular tourist area, but some of the other stations I have taught or worked at get many visitors. Some, like La Selva in Costa Rica, even have regular lecture series, etc, that the public can participate in. Costa Rica is where I do most of my work and teaching, but I have done some in Canada, Peru, Mexico, Australia, and France. Beautiful field stations in all of these places.