That's the funny thing about temporary ponds like that. They don't stick around long enough for fish to thrive so all this other stuff thrives, like frogs and those evil mosquitoes. Dragonflies too though.
Two from Manuel Antonio looking from a catamaran towards the beach.. overall shows how desolate the area is, national park at top and to the right. The close up shows the beach at 2 in the afternoon, normally full chairs and locals everywhere... pretty much deserted!