Visit the Malecon

If you want to relax and be outdoors, a good place to do this is the boardwalk, has a very beautiful view, especially at sunset. 
Weekends are usually families to enjoy free air and the great atmosphere there. 
They are local bands playing, food and sell becomes nice visiting the malecon.
And you'll discover many things there, like restaurants with different types of food from seafood to Italian food; There are also ice cream parlors, curios, and near where there are boats and cinema.