Where do you bring your not-yet-walking babies?

I have one year olds who don’t walk yet and I’m constantly at a loss for activities to do out of the house. Kid friendly places like playgrounds and splash pads don’t seem like they will be fun until they are walking. It’s too hot to take them on stroller walks for much of the day. The zoo and aquarium and both 30+ minute drives. Am I just supposed to go to the mall and target over and over again? Is anyone else struggling with this? Am I not thinking of some fun option? It’s summer and hot and I feel like I’m going crazy in my living room, help!