I am now back from Puerto Rico. I was able to find some awesome locations for setting up my temperature sensors. They are extremely diverse and include a rainforest, a parking lot, a beach, a baseball field, mountains, valleys, and plains.
I made a web page with maps and photos of the sites. It is available HERE.
The data I retrieved was wonderful! It gave very valuable information about the microclimates of each location, information that I can incorporate into my forecast model to further improve weather forecasts in remote areas.
I may post some additional pictures later (of other places I visited).