This one might not be the best one of Keaton, but the adventures of one family on the self made boat is entertaining enough that it is worth your time. To understand the joke where Buster sends out S.O.S signal is good to know that the name of of the boat 'Damfino' means damned is I know. Also, International Buster Keaton Society (yes, there is such a cool organization) is called 'The Damfinos'.
Films starts with the scene, where Buster tries to get the boat out of the house and from there, one thing after another goes hilariously wrong that you finally start feel for the heroes. Fantastic scene is where the boat capsizes repeatedly and Buster runs like a hamster in a wheel while trying to send S.O.S. message.