Hi Eileen, the day and time your trying to book is full. The reason you can only choose 0 or 1 is because one of the groups is traveling with an odd number. Since each boat holds 2 passengers and the odd number member has a boat by themselves the system is trying to fill that seat of 1. However we do not mix groups on 2 passenger boats so the system is not going to allow you to go forward with your reservation. Please give us a call if you have further questions
I called to book my tickets. They were prompt in replying.
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