FYI - a friend and I took our ~20 month old toddlers to playwisekids in Columbia yesterday.
https://www.playwisekids.com/events/index.htm
I've seen mixed reviews so I was a little leery, but still curious. It was a huge hit and the kids loved it; I actually got to sit down for a few minutes! Its a huge area w/ lots of different "play" rooms, but they all have half-walls so you can keep an eye on your LO even if they run out of the room you are in.
It was pricey ~ 16 for the day, but a good choice for a hot or very cold day. You can also buy memberships, but I didn't really look into that.
Re: indoor play place