P.R.
I guess the 11 month old might be to young for Disney, but they do have a section for little ones there. Holiday World is designed for little ones in an entire area as well. I guess you have to divide up a little bit so one of you can continue on with the 14 year old while the other two are napping etc. If you have a room with a pool area you can always retire for the nap time thing to the motel/hotel so the younger ones can take a normal nap in the room while the older one swims, etc.