I don't know how many of the activites a 23 month old will be able to participate in, but will probably enjoy watching. There are lots of Lincoln Logs and a building table in the entry. There are "horse races," although a toddler might get trampled by the elementary school aged kids. The servers will deliver "small" and "large" glasses of drinks, which might amuse a toddler, as will the straw-throwing.
All in all, it's is a very family friendly place. The kids can get up without bothering anyone, and it's loud enough that noone will notice if your kids are a littel loud. Our daughters (6 and 4 last trip) LOVED it.