We love to take our 2 and 3 year olds to Romp n Stomp for open play!
Its never super crowded and the staff does a great job watching the kids and helping them as needed. Its always very clean, toys are put back nicely in the toddler area, and kids cant escape because of the glass doors leading outside. There is enough staff around on open play days that you feel like your little ones are safe.
There really is a lot to do for kids of all ages, even toddlers. Our kids look forward to it, and I cant wait until they are old enough to have a Birthday Party there.