S.Y.
We had a 1 year old party for my daughter at My Gym as well. It was great because the staff leads the entire party and they have circle time, songs, bubbles and play time at the end for all the kids to jump around in. It's a great place if there are younger and older kids cuz there are a lot of toddler friendly toys. You will just need to bring some food and cake and decorations (or they can do their standard decorations). They even allow some alcohol if you want to bring a cooler for the adults! We went to the My Gym in Tustin right on Edinger near Jamboree. Really clean and new.