Snorkeling is great fun... and sometimes you want to go a little further out than you want to swim.
If where you are vacationing has one of these for rent, definitely give it a try. You can go for about an hour on a charge. To see the full specs...go here.
There is no chance of whacking yourself since the blade is enclosed in a cage.
You push a trigger to run the scooter...so if you let the scooter go, it won't swim home with out you :-)