2 Russians in Cancun, now strip naked and get a tan
There are 2 gay bars, but believe me they are not worth it. If you are on the strip you can take the bus which will bring you to the city center and drop you off. But a cab would be better. Cancun has be commercialized with American fastfood joints and bars. But don't miss Chichen Itza (mind the spelling), and please don't fall for the , "come and hear the condo seminar and get a free breakfast and a tequila bottle."
Here is something that I got for you from tripadvisor, if you have not seen this already. Yes make sure you exchange your money into pesos, don't pay with US dollars.
ISLA MUJERES
We spent a day out at Isla Mujures, and its highly recommended. Our concierge recommended a ferry on the north side of the hotel zone, which turned out to cost $15/person round trip. With a little more investigation we found out that you can take the R-1 bus that say's 'PTO Juarez' on the front of it (not all R-1 buses go to Puerto Juarez) to Puerto Juarez and take the UltraMar ferry for $7/person round trip. It leaves every 30 minutes all day long and is a quick 20 minutes trip. Once there you will be inundated with people renting scooters and golf carts. For fun we did some bargaining and got a golf cart for $42/day. A tip on bargaining: be nice and curteous, and when they don't move on the price, simply thank them and walk away, the price will suddenly go down. It worked like a charm for us. If you get a golf cart make sure to take it down to the south side of the island to the lighthouse. There is a great gift shop and cafe there with a great view.
CHICHEN-ITZA TAKE THE TOUR INSTEAD
After much deliberation we decided to rent a car to go to chichen-itza rather than take a tour. It was a great decision. There is a toll road that costs about $18 each way to get there, but it is quick, safe and easy. We never had a single problem renting the car or with police. Although we passed several police they didn't even seem to notice us, and most of the cars on the toll way were rental cars anyway. Overall it was slightly more expensive than taking a tour ($50 for rental car with ALL insurance, $40 for tolls, $18 total for entrance fee), but was much quicker (about a 2 hour drive) and we had alot more freedom.
JUNGLE TOUR
This was one of the highlights of our vacation. We booked a joungle tour through our hotel with Blue Ray Marina. The tour lets you drive a small speedboat through the bay, then out into the ocean. Once there, you tie up your boats and snorkle on a reef that is a few miles out into the ocean. The snorkling was incredible! It was a great live reef with lots of fish and we even saw a sleeping shark. If you do anything in Cancun, take this tour.
RESTAURANTS
While there we also ate at La Distileria, an excellent place with great service and food. Also ate at Lorito Joes across from the Marriott. They had excellent seafood and a nice staff. Ask to sit outside by the water and ask if 'enrique the alligator' has been by. He literally swims up right next to your table and waits for the staff to come feed him.
A FEW OTHER TIPS
The buses in Cancun are a great way to get around, they are only $6.5 pesos (about $0.65 US), come very often, and will stop just about anywhere you ask them to (and won't stop if you don't ask them to). I read several posts on here that you have to have exact change. Although helpful, we found out that by law, if you use a $20 peso bill they have to give you change and had no problems.
We also took about $100 in $1 bills (US) and used those exclusively for tipping. It worked great. I would recommend paying for everything in pesos and tipping only with $1 bills.