People online often tell folks not to rent scooters.
If you are not a regular scooter/motorcycle rider at home, then I agree that Cozumel is not the place to learn, practice or ride for the first time in ages. If you are a rider, then to me Cozumel is no worse than riding in the States. I understand some riders disagree with this, and that's fine, but I really can't see how since drivers in the U.S. also drive erratically, distracted, drunk, and angry (plus usually faster, plus more teens driving, plus numerous tractor-trailers and RVs creating blind spots, etc., etc.)! To me you hear a lot about scooter accidents in large part because: (1) mainly, they rent scooters to people who do not have motorcycle licenses (yes, experienced riders can have accidents too, but the great number of novices skews things hugely); (2) a number of people drink and ride -- always a bad combination; and (3) the sheer number of scooters means that you will, of course, see more scooter accidents.
In any event, cautious riders always assume that drivers will do crazy things, and they usually do
- Watch out for topes (speed bumps that range from worn away to massive plateaus, and may or may not be painted yellow, and may or may not be marked by a sign - or the sign may be covered by a tree);
- Watch for drinking and/or lost tourists driving rental cars or scooters, especially in the mornings after the cruise ships get in and people hop in rented cars to head south -- and about half of those folks will head north mid-afternoon, and the other half will make the full loop around the same time;
- Watch for sand that gets blown onto the road, sometimes far from any beach; know that the paths into many beach clubs and Punta Sur are dirt/sand and rutted, so can be quite tricky on 2 wheels; don't try to go up north on the dirt road on the eastern side of the island where even dirt bikes get bogged down;
- Watch for other scooters passing on either side, especially in town;
- Watch for dogs in the neighborhoods, as many/most roam freely;
- Watch for bicycles, tricycle carts, scooters and cars with few or no lights or reflectors at night;
- Watch for stop signs that may be to the left or right side of the road and may be covered by tree branches;
- I would not ride too close to the right side, as often vegetation will grow into the road a little and often leaves and other debris are near the edge;
- I would suggest renting scooters with larger wheels from reputable rental agencies, such as the Honda Dios rented by HTL Rentals or Rentadora Isis, among others, as these are more stable than those with smaller wheels.