As someone who has a 9-5 often stressful office job, I find this a perfect way to relax during a sunny weekend. You get to get away from the big city's craziness for a good hour. They have pretty good food on the Kajama ship too. You can often buy tickets on Groupon, so it's not even that pricey of an experience.
What's pretty cool too is that if you go on a Kajama ship, you will pass by the airport, so sometimes planes fly right above you at a really low altitude. Pretty awesome!