Know the difference between discretion and recklessness. Going at it in the middle of a public toilet is bound to get everyone into trouble if it happens too often. Doing it in a park in daylight, in winter when the brush has been reduced, is going to lead to unwanted attention. Wherever you are, clean up after you're done. Don't leave discarded rubbers and used tissue all over the place.
Litter is a first source of complaints by the general public for many cruisy places.
If the situation arises, 'come out' as a cruiser. There are 2 pair of booths with gloryholes, and 8 booths with no holes. Pairing is allowed, if you are sly. Since we don't like being treated like misbehaving children, we left. There were 9 guys all sucking, fucking and rimming each other.