Slope, Surface, Stock, Length, Obstacles, Wind is the checklist.
Of course in a glider, go-arounds are not an option, but glider pilots at busy clubs get lots of practice slotting landings around other gliders and retrieve vehicles, and trying to avoid obstructing the glider behind. It does help to have a 50 yard landing roll
My favorite outlanding field is bare and regularly cultivated -- decent surface, no stock, rocks generally removed, not much crop to damage or cause a groundloop, unattractive to strollers and animals.
Even better is a strip where the towplane can come get me. A few strollers and/or animals in one spot a glider can work around, but a crowd is a different matter.