I like Anastasia SP - stayed there twice. Sites can be on the small side although their website does a good job of laying out the useable dimensions. So book sites (those of you reading this) after you see the dimensions of what's available. Oh - my pro hint for ASP - the racoons there are not amateurs - They.Are.Professional.Hustlers. Take extensive steps to protect your food and smellables. Don't ask me how I know.
The St. Augustine Lighthouse is not far from the entrance to ASP on the way into St. Augustine. We visited as many lighthouses as we could in a 3-year span about 5 years ago (all over the state). And St. Augustine was one of the first ones. Nice climb, good museum at the base.
I recommend Sunset Grille which is south of ASP in the town of St. Augustine Beach on Hwy A1A (Beach Boulevard). Lunch or dinner. It was all good for us.
That's a great pre-visit before FW. There is a Buc-cees south of Jacksonville before St. Augustine and also one just to the north of Daytona Beach before the i4 turnoff. If you're a beaver fan.
I'm excited for you. St. Augustine is a historical gem and underrated IMO.
Bama Ed