For the eco-tourist, there are a few good options in Central America but otherwise not a terrible inspiring list.  Loyalty Traveler has the whole list and Points with a Crew has a map of the properties.  The ones that jump out at me are as follows:

Intercontinental Maracaibo – I know Venezuela is not in a good position now for tourism but this hotel is in an area close to good birding and I am dying to go there.  But make sure they have toilet paper!

Crowne Plaza San Jose Corobici – Good for an early flight out but PLEASE don’t spend your whole time in Costa Rica in the city just because there’s a good deal.  Costa Rica has so much more to offer!

Intercontinental Santo Domingo – Lots of good birding in the Dominican Republic and this looks like a really nice hotel.  Just need to get up early and drive out to the birding hotspots.

Holiday Inn Panama Canal – Well positioned north of the city on the road towards Soberania National Park, an easy morning drive.