Map of Cancun Hotel Zone

There are plenty of maps showing all the hotels. Here is a map showing shopping, restaurants, and other vacation necessities. Each of the Plazas is a large shopping mall.

If you want to be "where the action is", pick a hotel near the top or along the northern shore of the hotel zone. From there it's walking distance to the most popular spots for nightlife. The east-west stretch is crowded with bars and restaurants.
If you want something quieter and less crowded, but still within walking distance of shopping, restaurants, and watersports, stay somewhere in the middle of the long north-south stretch. The rest of the hotel zone and the downtown area are still within reasonable bus and taxi distance.
The southern part of the north-south stretch has some luxurious hotel complexes and the exclusive Club Med. This section seems more for those who want to stick close to the hotel, or don't mind driving long distances to get to the other attractions.

Well, that's my amateur attempt at a map. For professional-quality results, check out the site below.