I don't think there are any scuba compressors or Ops around Holbox. The water is pretty murky, no coral. You pretty much go to Holbox to swim with the Dominoes and enjoy the quaint village but there are some other tours possible.
A day trip starting with a ferry to Chiquila, drive local roads with potholes and speed bumps to Chemax, Valladolid (take the loop around, don't go thru!) and almost to Piste to tour the ruins at the same time of day that the bus tours arrive, then back, would be pushing it. Mapquest has a few Mexican cities in their program but not Chiquila so I can't tell the mileage. Looks as challenging as a day trip from Cozumel, which is done but it's hard.
Here are a couple of zoomable maps for the area....
http://www.locogringo.com/lgunet/images/maps/roads/masterYUC.png
http://www.locogringo.com/lgunet/images/maps/roads/masterQR.png
When I did Chichen Itza, we left Coz on the afternoon ferry, arriving at the lovely Mayaland hotel at the back gate to the ruins well before dinner, then had a leisurely breakfast before hitting the ruins when they opened - no crowds. After a few hours there, we skipped lunch and headed over to Ek Balam north of Valladodid and found it as rewarding as the more famous site, then got back to Coz in time for dinner. We had rooms paid for on Coz and at the ruins both for one night but it was worth it, especially not carrying all of our scuba gear.
How are you getting to Holbox? What are you other trip plans? You might consider rearranging to include a night at the ruins.