From the parking lot (located on Lake Street between California Street and Nevada Street), walk back along Lake Street towards California Street.
Just past the corner where California Street dead-ends into Lake Street, you will see a bridge. Follow the path over the footbridge. Take the first path that branches off to the right after you cross the creek. Follow that trail as it goes up along the split-rail fence and it will take you along the top of the bluff. The cypress forest is all along the top of the bluff. You can take the trail all the way through to Cypress Avenue. Then you can go back the way you came to return to the parking lot, or complete the trail loop by turning left (inland) on Cypress for about a block, and you will come to the paved path again. Follow the path and it will take you back over the footbridge to the parking lot.
The walk through the cypress forest takes 10-15 minutes, so you can do the whole loop in as little as 30 minutes.