Jacksonville, Fl, Vero Beach, St Augustine, Stuart would seem like good places to look. Oriental, NC., Savannah, Ga. Annapolis, Md. Most of these places have some sort of transportation system. many marinas also have a courtesy car of some kind.
Verizon has very good internet access. you can buy an external antenna if you are in a fringe area. Most marinas have wifi, some include it with slip fee and some charge extra. Some charge a 'livaboard' fee. Some charge extra for electricity.
If you are in Florida in the summer you will need A/C for sure.
I'd bump up the boat budget some.