Most of the hotels have a kayak for the guests to use. Normally, you are not supposed to go outside of the designated areas but we did. We just made sure that we didn't throw trash around, trampled across private property, or kill the wildlife. Remember, you can go on the motus but stay on the beach or the owners might get mad.
We kayaked around and when we found nice spots to snorkel, we jumped out and swam for a little bit.