Progreso with 2 toddlers

It doesn't look like theres a lot of tour options that are really kid friendly at Progreso and we're going over during Christmas week and they seem to have less tours than normal. Looking for suggestions. Planning beach resort at cozumel and not up for 2 beach days so that's not an option. What's the pier like? I'm kind of thinking we may just get off on our own and spend a couple of hours. Any suggestions from those with littles? Kids are 1 and 3, the 1 year old is easy and will just nap if not interested. 3 year old not so much!