A few things came to mind for this.. just suggestions...

Spikes to tie her spread eagle to the ground..

Chain, spike and collar to keep her well tied up if you are into that..

Leather mitts, foot gear and knee pads.. if you wish her to crawl.. To keep her skin from being callased..

Engine hoists are great for suspension..

Saint Andrews Cross is also fun..

I would also suggest pullies as well to attach to the trees because if you are in a scenario you need to get her out fast you wouldn't want the rope to be tangled on a knot on a branch, and it is easier for hoisting her up if you wish as well..

Proper ankle cuffs and wrist cuffs for suspension may also be a good idea.. I find ones with sheepskin helps to keep her up for a longer duration..

Being outside also allows room for some water bondage as you don't have to worry about damaging floors as well..

So a cattle watering trough may be an idea.. an Outdoor watering hose or even a power washer maybe interesting..


For night play i would suggest some torches and a fire pit as well. but that is up to you..

Just a bit of brainstorming is all.. Hope it helps

hugs
snow