Taxis are cheap in PV, - take the open air ones. Also, ask at the hotel, but take the buses. PV is laid out up and down the beach for the parts you'll be going to. You can take the bus from one end to the other for about 27 cents, it may be cheaper now since the peso has devalued more.
Some buses take slightly different routes (they may go up a block or two off of the beach and then there are some one-way streets that cause them to zig-zag around, so ask the bus driver as you get on if the bus is going to where you want, then ask the people on the bus where to get off at. Pay attention,there will be buzzer buttons to push when you want to get off, otherwise the bus doesn't stop. Some of the people won't speak English, but if they do, they'll help you out.
Bill