We went there on our own via rental car and got there just after the grounds opened at 8am mid week. Parking was 80 pesos. The lot was relatively empty and we were able to park in the shade of some trees. There were no entry lines; there were few tourists inside that early so it was easy to get photos without anyone else in them. It was also early enough that the morning was still overcast the heat had not set in, so the temperature was great for walking around outside. Entry was recently raised from around $12 USD to almost $27 USD (which I think is way too high; it should go back down to $12). The structures are beautiful and I’m glad we went in general, but the amount of vendors inside the architectural zone is out of hand. It almost feels like you’re at a flea market vs being on a cultural site. The amount of vendors really takes away from the experience of walking through nature and immersing yourself in the awe of the ruins. I think it would be more respectful to the history of this place if the vendors were kept outside the grounds or only at the entrance. We enjoyed our time here; but I know I would not have found it as enjoyable if we showed up any later in the day when it is hotter, there are more tourists, and more vendors set up. I recommend getting there around 8am or be prepared for the heat and crowds.