Well, not an entire day, but an hour and a half gave us enough of a trip,  time for our sandwiches, and time to learn how to steer. I have the exact wrong instincts on boats, though–pushing left when I should push right and so forth. The Cherwell Boathouse was pleasant, though,  the river uncrowded, and the children well-behaved. And on the way there Benjamin found an interesting puffball/earthball/earthstar growing out of an ancient wall.