The best thing to do in Cancun is to book an all-inclusive hotel service, visit beautiful places and visit the best restaurants to eat. You can also find private transportation in and out of the city with agencies like Cancun Airport Transportation.
A tip to get to know the city without depending on anyone else is also to make your appointments or reservations in advance for lodging, transportation and dinner reservations in the city. Getting to know Cancun has never been so easy.
Enjoy this beautiful city.