Nothing really within reasonable walking distance from the cruise dock. There are some flea market type shops, but the prices are inflated compared to Puerto proper. Once in town, streets are in real rough shape and a lot of the buildings are worse. A good chunk of town looks like it's about to collapse any second. Even out in the residential areas, the million dollar mansions aren't too impressive.
The people are some of the nicest I've ever met though. I think the highlight was just casual conversation with the people of Puerto Vallarta. Just some lovely lovely people, even when they're not trying to sell you anything.
Beautiful place. Unfortunately, the cruise dock also isn't really near much. Some shopping, but it sucks. The only thing of value in Cabo is the resorts (which you won't be using if you're coming from a cruise) and the Lover's Beach area. You need to pay a water taxi to get you out there. Totally worth it though. Likely the best beach I've ever been to. Totally beats anything in Hawaii and everything I've experienced in the Caribbean and Bahamas. Castaway Cay has nicer facilities (Lover's Beach literally has nothing; people use this one cave for a bathroom), but the air and water temp at Lover's Beach was literally perfect.
The place is a total tourist trap though. You are constantly besieged by people asking you to take a tour with them or buy something. If you want to know what a celebrity feels like being hounded by paparazzi, this is similar. Not especially nice about it either.