Nah, I don't usually, but I wanted to be able to see the dolphins properly. I did, however, take my cochlear off for the part where she pulled me along in the water, if that had fallen off, I could have been without it for the rest of the holiday, wheras glasses I could have replaced easily enough, should they have fallen off.
Indeed, it was a great oppotunity to be around them. They are awesome creatures. Some people would say it's mean to have them swim with us humans and stuff, but they seem to actually enjoy it, same as dogs enjoy fetching balls and doing tricks and stuff so it's really not.
If you ever get chance to do it, do it, it's good fun and amazing