OK, here is a map I put together for parking; we'll be using the North end of the park. The red square is where I plan on having tournament central/check in at (just south of the lawn bowling courts). Parking areas nearby are in blue and ways into the park are in orange.
Enter from Aurora (must be northbound lanes), turn right at 59th street and take the first left into the large parking lot.
The other entrance you can use is off of Greenlake way if you take the road just north of the tennis courts and take a right turn at the dead end.