Tampa Bay area is generally very pet friendly so there are plenty of beautiful places where you can also bring your dog on a leash. As long as you also clean up any mess your furry best friend might make. Shared pathway along FL-60, also known as Courtney Campbell Causeway Trail along and across the Old Tampa Bay is one of those places.
If you enjoy watching the wildlife, there's a good chance you'll see dolphins and pelicans, especially from the bridge. Fishing seems to be very popular in that area as well. I just haven't figured out yet where the closest facilities might be.
More info about SR-60 shared pathway
Dogs on leash allowed