Oh, and bioluminescence - the only time I've ever seen it was in Belize, on last year's trip. Took an excursion to a lagoon where it's pretty impressive. It wasn't *quite* dark enough to have it be spectacular that night, too much moon, but it was pretty cool. A couple of brave souls swam in it. I wasn't keen on being in the same water in the dark as large swimming amphibians, so I took a hard pass on that.