A.S.
Laguna Niguel's Regional Park is a nice one. It has a playground, lake, lots of grass, covered picnic areas with BBQs, etc. Here's the address:
Laguna Niguel Regional Park
28241 La Paz Road
Laguna Niguel, CA 92677
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There is a charge for parking - $6 I think.
Also, here is a link to website with a list of the parks in Laguna Niguel. Click on the Parks & Recreation tab to get to the list.
http://www.ci.laguna-niguel.ca.us/
Have fun!
A.
Anaheim