Hi,
The walk isn't long at all and the people there are so great that I'd never use anyone else. I did use the Disney excursion once, but they took us to a deeper part of the sandbar where we couldn't stand and the stingrays were all about 15' below us. Total bummer. Capt. Marvin has had amazing service, nice guides, and on the boat ride out and back, they look for wildlife and stop for photos if there is anything interesting. Did you know that Capt. Marvin is 86??? He's still piloting one of the boats and he's a real character!
Hope this helps,
auntrenae