Took the free trolley to El Morro. Toured the fort, then walked to La Forteza and toured that. Entry is $3 for each, or you can do both for $5. We then walked down to St. John's Cathederal and walked the streets around old San Juan. Walking was easy from El Morro, since that was the high point and it was all downhill from there. A walk up would be a struggle for those not in good shape (like me!).
Walked off the pier and turned left immediately at the beach. Walked throught the Port authority "Resort", and grabbed two chaises at Jack's. Beer is $2 cheaper, free wifi, and no charge for the chaises. Beautiful sand and water. Great last stop.