Welcome to Cobá
Cobá's ruins are a treat and there's little reason to come here if you're not planning to explore them: the state's tallest pyramid, a beautiful ball court and a variety of other structures make for a fun few hours exploring. The village is quiet and cute, with a croc-filled lagoon, a couple other sights and attractions, and a few hotels and restaurants…but people come for the ruins. In droves. By the busload. In fact, that's its biggest problem: arrive after 11am and you'll be one of literally hundreds of other people coming in from Cancún, Playa and Tulum.
From a sustainable-tourism perspective, it’s great to stay the night in small communities like Cobá, but don't plan on staying up late.