Recommend you contact a reputable bio-bay tour company that uses an electric pontoon boat, or kayaks.
We have gone twice, and the first time was with a more 'fly by night' operation.
The operator had to borrow my light, let a kayak get loose, and almost drowned himself trying to swim to it with a paddle and no life jacket on.
If it were not for the swift actions of our crew he most certainly would have drowned.

Second time was in an electric pontoon boat, and it was great!

We take a ball off Esperanza. have not had theft problems. Maybe we got lucky.