Scooters in Bermuda seem to work okay, and that's driving on the left side (i.e. UK rules). I hardly ever hear about any tourists getting in accidents and I've been there a couple times a year for about the last 15 years.

Then again, Bermuda isn't frequented by the "spring break" crowd. You're not going to have 12 drunk 19-year-olds scooting together in a big convoy there, because they just likely wouldn't be in Bermuda in the first place.