Nice Nature preserve with a long, wide bike trail with several walking trails. Some trails lead to docks along the canal. The wooden trail entrance to the left as you enter the park leads to a wooded walk area. There are two lockable restrooms, but be aware that some homeless people seem to take them over. Some guys sit in their cars apparently waiting for their dream visitor to appear.
No to Medium traffic park with woody trails and boardwalk with benches throughout, and a portapotty at the Northside. There is a parking lot at both north and south sides, but some access the trails via Oak, which dead-ends at a footpath to the east side of the trail loop. There are plenty of exposed and semi-exposed spaces, like the path benches, as well as a couple pretty hidden spots, like the steps at the butterfly spot and the portapotty.
UPDATE: This is now called Tropix. New owners, but all-inclusive rates seem to remain the same. They reopened the booth area, 3 theatres, couches in all 3 theatres, and also have private viewing. The staff are extremely nice and don't care what goes on. Clean for the most part; please clean up after yourself. Some are leaving their trash when garbage cans are nearby. The fee is $15 for three hours, no in and out (staff doesn't monitor the 3-hour rule). OR for $23, you get a key and 12 hours in and out. After the initial key purchase, it's $20 for 12 hours in and out each visit. There are three large screen rooms: gay, straight, and a third showing trans. There are comfortable couches in each, plus a large fuck table in the gay theatre. Two theatres have two large screens, and the third has three screens. There are booth rooms with red/green lights, some with single seats, several with three seats. There is a bathroom in the theatre area.