We did not have reservations and the boats are quite large so a single should not be a problem.
Usually they will be able to work you in, great fun & interesting tour!
Yes.
There were 7 of us on the boat. There was room for more. Not sure was the max is. Definitely good for a single since the interaction was with everyone. Awesome tour.
Yes, you can
Not sure, just call and they will tell you
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