A great outdoor space where it is private enough to have sex is a great find. If the culture there is also permissive of multiple partnering, a group sex party might be welcome. In that case, a truly special place has been found. Luckily, such a place is destined to be shared with lucky friends and like-minded people.
Any outdoor space that will host sex party action should be carefully secured as not to upset any neighbors. Permanent or temporary fencing is an option, as is allowing what foliage there is to grow up and become a natural barrier. Oftentimes as much natural coverage as can be achieved is desirable since part of the appeal is to be out in nature. That said, there should also be some light canopies or something similar to provide protection from the sun or any precipitation.
Though it is possible to have a great outdoor orgy with nothing but some blankets, the sunshine, and a nice backyard, a pool and a hot tub is a serious bonus. Just as people who seek out hotel rooms with Jacuzzis, just as many sexual adventurers would want to do it in and around water in a group setting. There is something amazing about finding a woman with a great set of tits or a guy with a good, stiff dick in the pool, kissing and fondling, then heading out to a mattress or blanket to fuck hardcore to hearts’ content. Some may even get into it so much that a strong-fisted hand job leaves a little DNA behind in the hot tub. If there are no house rules against it, it’s fair game.
Fucking in a group can be a truly amazing experience outside. The breeze is caressing wet bodies as they tumble. Fingers find their pleasure spots and tongues lick new and old lovers to orgasm. It is as if the whole glorious scene is blessed by mother nature, just as all creatures do it freely outdoors for other creatures to see. We humans have the benefit of condoms, personal lubrication, and sex toys. Other than those wonderful sex aids, it is an outdoor party hearkening to basic nature. People desire each other to give and receive pleasure. Why not go natural?