Oaxtepec (pronounced Watehpec) is a city in Morelos. The main industry of the city is domestic tourism (so don't expect to see many foreigners, if any at all) due to the warm weather and the large campus which includes several economic hotels, cabanas, campsites, several pools, and a waterpark.
Excovento
Swim! If you stay on the campus you will have complimentary access to numerous pools, including a very large and very nice olympic pool and a diving pool with diving boards of various heights.
Go to the waterpark known as PAO (Parque Acuatico Oaxtepec). If you are staying on the campus and have an identification bracelet (given to you when you check in to a hotel on the campus) you will get half off of the admission price, which should come out to about M$60 a person. There are plenty of terrifying waterslides/toboggans, a wave pool, restaurants, and a bunch of regular pools.
Go to the club house (Casa Club). Here, you can get on the internet, workout at the gym, go to a restaurant, order a snack like ramen noodles, or sit in a sauna, all free if you stay on the campus.
There are the usual knick-knacks one can expect to come across in a town aimed at domestic tourism.
Near the Excovento, you will be able to easily leave the campus (stand in front of the Excovento and go to the left of it if you are coming from the inner area of the campus). There are plenty of reasonably priced Mexican restaurants as well as a few stands selling very cheap and very delicious street food. There are also several places to get food within the campus although these tend to cost a little bit more than what you can get outside.
Abbarotes stores (convenience stores) seem to all carry alcohol. There are also a few liquor stores near the main square (which is near the Excovento and the place where all of the taxis are parked).