We were looking specifically for nematodes with our collaborator Ashleigh Smythe. I learned so much about a group that I had previously overlooked, and even attempted to key a couple out. If you've never tried to key out a nematode, make sure you have a brilliant nematologist with you to make it fun instead of impossible. I even now have a favorite group, the Stilbonematidae, which have an incredible ability to "farm" bacteria on their own bodies for food! They are, and I use this word quite seriously despite the fact that I'm describing a nematode, BEAUTIFUL. Definitely look up some SEM images - they look like an intricate braid.
We also SCUBA dived for sand samples in the Florida Keys, and of course collected chitons! I also got to hold a sea hare, find kinorhynchs and gnathostomulids, meet some microscopic sipunculids, and saw my first pycnogonid (sea spider). What a trip!