St. Petersburg Pier is a must if you are in the area. If you go early enough you may be able to park in the free spaces. If later then you will have to pay to park.
There are free shuttles from the parking areas to the pier. We prefer to walk.
The Pier is a unique design and is like an upside down triangle. On the ground floor are shops and the food court. On the second floor is the aquarium. On the top, fifth floor, are restaurants and outside eating.
You can walk around the ground floor and the fifth floor. On a clear day you can see Tampa. There is a small beach by the pier and a private air strip on the other side.