As you come out of Customs you'll go through the gauntlet of everyone trying to sell you hotel rooms, activities, rides, etc. Just continue on through them saying no thank-you and go outside to the taxi line. Unlike Cabo, the taxis in PV are a lot more reasonable even though there is usually an extra fee for the airport. Anyway, go to the taxi line and tell them what hotel you want to go to. From the hotel, they can help you get to the bus terminal.
If you don't have a hotel in Guad already, I would recommend the Hotel Morales which is a historical hotel right downtown within walking distance of places like the museum, the opera house and so on.
Hotel MoralesAnd I hope you'll get down to see Lake Chapalla. If nothing else, take one of the van tours.
You should really spend a couple of days in PV, it's a nice place with a lot of nice restaurants.
Bill
Nodwell RN110 out moose hunting. 4-53 Detroit, Clark 5 spd, 40" wide tracks, 10:00x20 tires, 16,000# capacity, 22,000# weight. You know the mud is getting deep when it's coming in the doors.