Need to add to anyone taking the toll road from the 91...

There are two the 241 and 261. I think the 241 starts off the 91 and travels to Laguna Beach. You will want to watch the signs and take the 261 towards IRVINE, i. e. keep going straight, don't make the turn left towards LAguna.

You can also exit at Santiago Canyon. Go right then turn left at Jamboree. Take Jamboree South to Pioneer, turn right, take Pioneer to Cedar Grove Park (just before the left turn towards Tustin Ranch Rd). Cedar Grove Park will be on the right side. There is another community Park on Pioneer, towards the top on the left side. That's not it!