Some other suggestions and ideas, all from experience.
Park benches work great, but often other guys will not look if you are right there with her. However, you can scout the situation and walk away a bit when you see some guy approaching. You can even pretend to be yourself a passer-by and visibly turn your head to have a look, so the guy realizes there is something to see. I remember once a guy passing by and noticing. He stopped a few metres away, waited a minute or so, and then came back and stopped a few metres away on the other side, pretending to be relaxing and having good looks at my wife's pussy for quite a while.
Longer green trails often have small bridges crossing over them or over residential roads. These work great, if the bridge has a railing, rather than being closed to its sides, and she wears a short form-fitting (not loose) dress. Then she can stand at the railing, with her legs shoulder-width apart, and any guy passing underneath can simply raise his head and have a nice look. I remember this setup once with my wife wearing a really short dress and absolutely nothing underneath, and a guy just stood under there looking up and enjoying the show for like 15 minutes.
Another possibility is to have her re-tie her shoes. Of course, she will have to put one knee on the ground pointing to the side and the other foot flat on the ground ahead of her, so to create an open an unobstructed view to her pussy. This works great with cyclists coming towards her, and also on bridges.
With a floor-to-ceiling window, one way I like is to pull a chair close to it and have her face the window with one leg lifted up on the chair pointing straight to the side, in a Captain Morgan pose that makes sure her pussy is all visible. Then she can pretend to be drying off after a shower, or applying some lotion. Another way that also works well is having her sit close to the edge of the chair, legs spread and one leg supported on it, and pretend she is clipping her toenails. One more way is to have her walk slowly or stand in front of it, with a (very) open bathrobe, pretending she is distracted on her phone. Of course, remember to have all the lights on if it is evening or night, and to open the window if it is during the day, otherwise sunlight will just bounce off it and make it impossible to see anything.
On balconies, I find that what works best is having her bottomless, either standing straight, or in a Captain Morgan pose, as for the window. Then she can pretend to be enjoying the view, or distracted on her phone, or whatever. Of course, make sure the balcony either has wide railing or transparent glass sides.
The benches and bridges tricks also work well if she is wearing transparent panties rather than having no underwear at all. Just make sure you remove the gusset. Also, you really have to choose the hotels carefully. The ones that really work well overlook scenic, touristic or pedestrian-only areas. Then you have all sort of opportunities for showing her off.