At Xel-ha there was a place where you could swim/snorkel into a cave. We took a few pictures with Alli's camera in her trusty (at that point) waterproof camera bag. We also caved (ha) and bought the "professional" photos the park staff took of us from above through a hole in the cave's ceiling.
I just love that picture of the four of us, swimming, in a cave, dorky snorkel masks on our heads, completely happy.
This side of him only comes out when he's really happy, and I sure love it.