Activities with 3 month old

Melissa • This is my 3rd pregnancy excited nervous all at the same time . We have a son who’s 8 a daughter who’s 2 and now expecting.
My question is there any other activities besides sitting in bouncer and laying on play mat that any moms are doing with their 3 month olds I'm trying to find other activities to keep her up and moving of course I let her sleep been when she's awake and bored?