I took a stroll from our beachfront condo between calle 4 and calle 6 along Avenida 5 to la Cueva del Chango on calle 36 just off 5th. It was a long walk, but lots of places to stop on the way. There was some construction going on when we were last there March 2007, so I'm guessing there's even more to see up north now. If you've never been to
PDC it's even better. All sorts of new places to explore. Enjoy!