To be fair - there are plenty of options. Those with navigatable rivers and estuaries gives the best back up plans should the sea be blown out (so long as they have enough water).
I'd be looking at (in no perticular order)
Torquay - plenty of coast line, great harbour and car parks but no river to play in. Tourist central so loads of accomadation options.
Dartmouth - not far from Torquay, and with a sib could always carry over if too blown out to travel by sea or its ideal to base there. Superb estuary, river and plenty to see and do.
Plymouth - a great option, rivers, the Sound itself, and lots of coastline. The town itself has plenty to do if its really grim too. Lots of marina options as well as air bnbs and camp sites locally.
Fowey - river, estaury and sea, in river moorings and they ferry you in and out.
Mevagissy - great to visit, nice to see, but if blown out, you're done.
Mylor / Falmouth - a superb area, rivers and coast line to explore, again lots of accomadation, marinas in both and I really enjoy Mylor.
If you have a look at some of the trip reports on here, theres a few plymouth ones to read and look at - I wrote one last week. I think they'll be a Falmouth one too.
https://www.rib.net/forum/f18/off-to...sty-90032.html
https://www.rib.net/forum/f18/kings-...r-89201-3.html
https://www.rib.net/forum/f18/queens...r-87578-6.html
https://www.rib.net/forum/f18/4-rive...h-83775-3.html