I hike a lot around town and have stumbled into several prime spots. Memorial is a known one. Bathrooms at Bear Creek Park were popular in the 2000s. End of Old Riley Fuzzel Road in Spring is still popping. The best was the boardwalk and observation deck/tower at Cullinan Park in Sugar Land years ago. There were directions written in sharpie on the railings in the tower that said "stand here to get sucked" and "stand here if you suck d*ck" or something to that effect. It was fun to stand there for a bit and see fat bald dudes in business casual walk up the boardwalk and look up at the tower and get excited.