These links are for various maps of the area:

http://www.mapquest.com/?cid=google&sem=1&ncid=MPQMAP00170000000007

http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&msid=111162172991000092690.00047523042d597fcf3fe&ll=34.080328,-118.240849&spn=0.017538,0.016182&source=embed

Or just use the picnic site listed on the EPMOA site!

The park will be popular on the first day of spring so be ready and bring water.

If you can walk or ride a bike you'll be better off.