The best time to see the ruins is, without a doubt, sunrise. The ruins at Tulúm, while not spectacular except for the two-metre rock wall surrounding the site on three sides, have one of the best views you could possibly hope for. The structures sit nestled amid the rolling green grass and white sandy beaches, hovering over the turquoise Caribbean. As the sun rises, the whole place is bathed in a warm orangey-red glow. Sitting on ruins watching the waves is pretty relaxing.
Since Tulúm is so close to Playa del Carmen and Cancún, the number of visitors is absoutely huge compared to a lot of other Mayan ruins, and especially given the small size of these ruins. Because of that, most of the structures are off-limits to the public, so you can’t climb up on them as you can at most sites. In the end, it’s nice to see that these ruins are being protected, but Palenque, Uxmal and Chichen Itzá are a lot more fun. That said, if you look hard enough, you will find a couple structures you can sit down on.