The Xmas lights of Saint Augustine are legendary and worth the trip! Santa costumes, Victoria duds, colonial reenactors, and carolers all over town.
There are some nice attractions and engaging museums all the way from historic Saint Augustine to downtown Jacksonville, which is up the road.
But, the biggest surprise was the Musallem Gallery... a retail art gallery between the two towns. They acquire private collections and until works get purchased by collectors, the pieces So, some of the most famous pieces in the region are at Musallem: see their paintings by Monet, Pollock, Whistler, Gaughan, etc.
A guided tour by one of the curators is clearly worth the effort and unlike the non-profit museums, it's all free. You are truly a guest and NOT expected to become a collector yourself. They are the collectors and it's what they love & live to do!