Is it rude if this happened?

Well 3 of my friends and i want to have a picnic at a park that is about 45 minutes away and the point of that park is to go swimming in the lake there. 2 of the friends and i want to swim but 1 of my friends don't. Is it rude if the 2 friends and i swim while we are there since that will leave out that one friend? That one friend knows that is the only reason we picked that park since there is parks 5 minutes away that doesn't require swimming. would that be rude of us though?