Ok a couple of things
NEVER change your money at the airport or the hotel. They will rip you off on the exchange rate. There is a small shopping plaza (where James is and a good guy for excursions) where you will find places to change your money as well as ATM machines. Most folks only carry enough USD to pay for their tourist card ($10) and exit tax ($20) and then use the ATMs . Do note that the ATM will only give Dominican Pesos and not dollars. Also notify your home bank of your travel plans or they will put a hold on your ATM or credit card with the first use fearing fraud.
The town of Puerto Plata is NOT within walking distance and you will need a cab to get there.
Here is list of sites to look at for tour and excursion info:
Mels www.mel-tour.com
outback safari http://www.outbacksafari.com.do/
Ocean world www.oceanworldadventurepark.com
isairatours: http://www.isairatours.com
Monkey Jungle and zip line: http://www.monkeyjungledr.com (my favorite)
James in Playa Dorada: https:/…home-1
Bavaro runners www.bavarorunners.com/
Hope this helps and have a great time
BObK