Coba is nice, better in some ways than Chichen Itza, because it is almost completely unrestored and you have to walk down jungle paths to explore it. I don’t know about scooters on that coastal road to Tulum though. It was a crowded one lane each way death trap, and I recall a dilapidated semi ahead of me pulling out of our lane into oncoming traffic while going around a turn with “Solo dios sabe tu destino” (Only God knows your fate) written on its bumper.