How about some don'ts:
Do not eat at the Santa Maria - it is obscenely overpriced and nothing but a tourist trap. Being able to feed fish through trap doors at your table is not worth the extra cost and poorer quality. There are MANY better places in town for seafood, best among them is O'Steen's (the original that all of the others try to rip off, including hiring away cooks from O'Steen's to work for them), but Schooner's is good as well, and Salt Water Cowboys as has been mentioned.
The Columbia is fine Spanish food. Collage is fine French and very good. The Gypsy Cab Company is also good.
Do visit all of the real historic sites: the fort (Castillo de San Marcos), the lighthouse, the old town, the historic museum inside the old town, Flagler College (sign up for one of the tours), the Lightner museum. The Fountain of Youth is a bit touristy but maybe worth doing once. The Ripley's Believe It or Not Museum is just like all their other ones - overpriced tourist trap but can be fun once in a lifetime...
If you'll have a car you can drive down a bit south to Fort Matanzas - small place, free, park service takes you on a boat out to the little island it is on to visit the actual little fort, and the main part of the park has some great nature trails and boardwalks. Just south of there is Marineland, beaches, and Washington Oaks State Park, which has both an ocean side with some neat coquina rock formations and an intracoastal side with rose gardens, ponds, nature trails, etc. Nice place.
St. Aug is one of my favorite places in the world and I'm quite thankful to live so close I can visit any time I want. PM me if you have questions or want to chat more about things to see/do/eat.
