hi there,
If you're looking for a slow pace vacation, San Juan is an urban jungle so if you're looking at San Juan, getting away is unlikely to happen in such a place as San Juan.
Having said this, San Juan it's one of the main selling points of the
Puerto Rico tourism industry, special places such as
Old San Juan where you can see historic landmarks. I would recommend staying somewhere like in Fajardo and take a day trip to San Juan.
hope this helps
Vacationbuddy