I don't know that area too well, but check out this site for some great ideas! There are a lot of different things you can search for and I have found some fun new places in the Irvine area thanks to this site.
I take my DD to a park in Cypress off of Ball Rd and Denni. It's about as baby friendly as it gets around there I think. The best baby friendly park I found was in Irvine when I used to live there called Bill Barber Memorial Park, it's a great park and probably the best I've been to from Irvine to Long Beach.
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Re: Good Baby Parks
I don't know that area too well, but check out this site for some great ideas! There are a lot of different things you can search for and I have found some fun new places in the Irvine area thanks to this site.
https://www.funorangecountyparks.com/
Karen
https://www.discoverytoyslink.com/karenchao