We just did it on the July 10-15 sail. DH, DD (10) and I. If you are claustrophobic, it's not for you. The seats are small and the air doesn't move much. You do have to climb down a staircase to get to the seats. We also boarded on a dock that then took us to the semisub where we boarded that in the middle of the bay. That said, it was peaceful and beautiful to see the terrain change--you are very near the floor of the bay (inlet, whatever it is) so you can see the dips and the sea grasses, etc. We'd do it again if we returned.