cruiseship to PV--sightseeing

We will be stopping at PV on a cruiseship for the day. Any suggestions for a great day of sightseeing?

There is more to do and see in PV then you can do justice to in 2 weeks. We have been going for 18 years. My real suggestion is to take a cab and go to Olas Altas (The Old Town), and the Malecon. and just walk around see the people, the stores and stop in for something to eat and drink. You will find the real Mexico there. It is less then 20 minutes from the Maritine center.