As far as a beachfront condo, there are a lot more selections on the East Coast over the West. Personally for a retirement area I think the West coast is much better. There is less tourism, less crime, and the gulf is warmer and more friendly to recreational boating than the Atlantic.
We have a Condo in Punta Gorda we use 3-4 months a year in the winter and absolutely love it. Punta Gorda Isles is criss crossed with canals so the majority of the homes and condos have access to Charlotte Harbor and the Gulf. If you like boating, fishing or sailing it's the next thing to paradise. Punta Gorda Isles has a fantastic Civic Center that sponsors about 20 different clubs - everything from sailing, fishing, cruising, golf, tennis, bridge, yoga, biking you name it. The clubs have monthly events, and socials. It's mostly retired professional type people. It's an extremely friendly community. Easy to meet people and between PG and Port Charlotte you have everything you need in the way of shopping restaurants, medical facilities etc. Yes we have no beach but Englewood or Venice both have nice beaches and are only an hours drive. You find once you move there you don't go to the beach much anyway. Maybe 2 or 3 times a year. We do have some beautiful barrier Islands you can access by either car or boat including Gasparillia Island, Boca Granda Pass which is the best Tarpin fishing in the country, Caya Costa State Park (access by boat only but it's like going to your own private beach) and Cabbage Key. A little further down you can hit Captiva and Sanibell Islands. It keeps you busy exploring all these places as they are all unique and interesting.