We did the Pacifico Brewery Tour...and I have to say I was more impressed with Mazatlan than I was with Puerto Vallarta. Again, cruise handled transportation.
I only don't rate this as a 5 plus because of all the vendors. They are extremely pushy and will sell you their first-born child if it means making money off of you.
My partner and I walked to the Cabo Wabo Cantina...got to see some of the town on our way, and enjoyed a nice cool beverage while we were there.