After lunch, we headed out to the emerald cave. It was a 200 foot stretch of cave that connected a protected lagoon to the outside world. We swam in, with about 4 feet of headroom through the cave. The first 100 feet were still lit, an eerie green light seepng in from below, but the rest was all flashlight. We ended up swimming through some jellyfish and getting all stung up in the dark. The hidden lagoon was worth it, though.