I would suggest you join a Playa Del Carmen facebook page and ask the question there. We vacationed every winter in that area for years, but it's been nine years since we were there. Back then I got all the answers and idea from a great forum that is no longer.
I do have a comment, maybe for others more than you. We have been to Chichen Itza on the spring equinox and saw the serpent. While it was a cool experience, that day was extremely crowded. I prefer both Coba, which is still open to climb, and Tulum, for ocean views over CI.
Where are you staying? The hotel probably might have good recommendations for tours. I will ask friends that still go if they have any suggestions.