They reject the idea of a sea trip, as J. explains, because a week is to short a time to get over the initial seasickness. Just as one gets accustomed to being on a ship, the trip is over. He notes however, that while everyone gets seasick, once they are back on land, they seem to "forget" all about it, leaving it out of the accounts of their journey.
It is finally decided the three will take a boating trip up the Thames River from London. This seems a fine idea to everyone except the dog, but a vote is taken, J. says, and the dog is outnumbered.