New Hampshire - hiking; skilifts up to see sights; Has shul and kosher food in Bethlehem. Drive there, but takes about 8 hours.
San Francisco - enough to do for a week- kosher food, minyan? Reasonably priced flights. Can probably get a reasonable hotel.
Mystic, CN-2 days; Newport, RI -1 day; Boston, MA -2 days. These are the minimum time in each place. There's more things available. Drive - maybe too much. Hotels ca be found for reasonable prices. Food and minyan- sometimes. Things to do: historical, old buildings, water sports. You go at your own pace and interest.
Maine- Bangor has Acadia National Park- beautiful hiking and nature. Can drive or fly and rent/drive. Chabad of Bangor and Portland have Shabbos packages. Otherwise no food or minyan.
Florida flights are cheap in summer, but it's very hot and humid then.