You can stroll along Port of San Juan for relaxing water views when you're in San Juan Antiguo. Hotels.com travelers also say the area is full of friendly people and has lots of nice beaches. If you carry on walking you'll get to Pier 1, San Juan Ferry Dock, and Pier 4 for some more water views.
If you're planning a bit of sightseeing head to San Juan Gate— just one of the monuments in Old San Juan. Hotels.com travelers also say the area is artsy and has lots of nice beaches. San Juan has other landmarks you might want to visit such as Pan American Pier.