El Morro is very picturesque and in excellent condition. Entrance is only $3 - but for $5 you can also visit San Christobel fortress, also in Old San Juan. You should plan to spend 1-2 hours visiting El Morro which is on five levels, with more than one way to access each level, some inside and some outside. There are lots of interesting well laid out displays.
The free tourist trolley pulls up right to the front entrance which handy.
The reason I did not rate this a "5" is the lack of guided tours (except one on Saturdays), no available audio self guided tours, and the water in the fountains has a really nasty taste.
Just outside the fortress on the sea side is an interesting cemetery, which is also worth a visit (about 30 minutes)
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