I have found the marina community to be filled with some of the nicest and most responsible 'neighbors' one could have. As SD mentioned, you may want to either rent a boat or consider taking a 7-14 day vacation on a charter somewhere to make sure the close quarter thing works as per your thinking.
i dont think you are crazy at all. the three stateroom thing makes sense, as was mentioned in another thread that kids really like having their own space, but you probably already know that...
i dont think you are crazy at all, if you can get out of the house without getting killed in the current real estate market....
How inappropriate to call this planet Earth when it is quite clearly Ocean ~ Arthur C. Clarke