Ciao Erik -- como stai? You'll love Cozumel. I hope you make it there next year! In answer to your questions...
1) Is Cozumel Equalizer a good dive op ???
We dove with them six years ago and thought they were very nice, but a little too basic. They didn't ask us where we wanted to dive or what we wanted to see. We've switched to another dive op and have been very happy with them for the past seven years. Let me know if you'd like more information.
2) Which is the best period to visit Cozumel ???
We've been there during all times of the year. Never had horrible weather for more than a day or two...
April - June can be beautiful, but can also be pretty rainy
July - August is hot and can be muggy, but there are not as many people around
September - November has wonderful temperatures, but there's always a slight risk of tropical storms and hurricanes
December - February is beautiful but the water temperature is cooler and the evenings can get almost chilly (almost!)
3) Things to do and things not to do once there...
Dive...dive...dive
Visit the east side of the island
Visit San Gervasio (the local Mayan ruins)
Walk down any of the major streets to the east of downtown (3oth ave on) and stop in at local shops and restaurants
Go to the plaza on Sunday evenings and enjoy the music and families
Eat at all the great restaurants
Take the ferry across to the mainland and visit Tulum, Coba and/or Chichen Itza (ruins)
Take a few days to visit Isla Holbox (mainland) to see the whale sharks (if you go in the summer)
Go to
www.cozumelmycozumel.com for more ideas
Ciao ciao --