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Birthday party etiquette, to give boat rides or not?

We are having a backyard party for my daughter's 1st birthday. It will be adults and kids, about 35 people total. We live on a lake and have a pontoon boat that seats 10. Should my husband give boat rides during the party, or keep the boat at the dock?
Is it rude to do something at a party where everyone cannot come at once?

Will it take away from the party, or add to it?