My gf and I (neither older than 31) are going to be in town for about a day (Sunday thru Monday) before heading up to Savannah and we want to hit some of the good spots (i.e. Castillo de San Marcos, Fountain of Youth, maybe Ripley's, Pirate Museum, etc.). Unfortunately, we are really confused on where is a good area to stay in to see these sights (i.e. downtown, historical district, by the beach, etc.). Any help will be appreciated.
Also, in that short span of time (say early morning 9a on Sunday, until Monday around noon(ish)) what is logical to be able to see and enjoy during that time?