Any verdant, tropical setting is a highlight in February. Beyond that, Mayan ruins, small hotels on Isla Mujeres, and time with my wife provided the key standouts.
The ability to indulge my fascination with grocery stores was nice, with mini supers galore, cheap cigarettes, etc. Even a Saturday morning trip to the Laundromat was a highlight.
Best Way To Get Around:
Buses in Cancun are cheap and provide an opportunity to escape the hotel atmosphere. Scooters on Isla Mujeres allow for the illusion of easy riding for the middle-aged fellow escaping winter and his kids.