This is a perfect place to mingle with the locals (Ponceños) and to look out at the water and catch a cool breeze. There are also other things to do, like for example, feeding the pelicans and other birds around.
For one dollar you can buy a bag of sardines and feed them to the birds. These activity has been done for years so the birds are used to the humans and they get really close to you in order to "catch" their free meal.