I thought of this as well like go on a cruise stop at 3 different locations for to stretch, to shop, to eat, to party but when it's time to get back on the cruise it's time to get back on the cruise you will be left lol. I would like a hotel style to check in the cabins ocean view, second class and lower class, restaurant, pools to relax, bars, Cabana persons, entertainment and shops. Also the downside Sims getting sea sick, you get left, ship wrecked stuck on an island or just straight up Titanic but that will probably be to morbid.