If you want to do South Wales I can help out as much as possible locally - 2 marinas on the haven so there shouldn't be too much berthing issues, plus a fair few free use slipways.
Accomodation is ok locally, both camping, B&B's, hotels etc... (the hotels aren't 5 star I don't think tho).
Only snag down here is weather which would work either to some peoples benefit (ie lots of fun) or others annoyance - get a good SW come in, and the wavelets in the solent will look like ripples
If the tides are right, and nice and high, it is possible to get up river as far as navigable to a couple of pubs in the evening. Even if really rough outside, there is still a good few miles of river to burn off some fuel on.