Other options, different places....
I am not into public sex but I like the outdoors lol~!
Hit a trail and then maybe slowly hike off the path for abit, find a place that would not be visible or people would not go to, ground lying up against a tree works also. Don't tell him anything just be spontaneous about it, so there is no hesitation.
Another option, is seeing the backseat of your car, if you live in a populated area find an unpopulated parking lot at night.
Skinny dipping on a hot day in a lake/pool or hottub followed by some sex never hurt either.
Rent a hotel room with a hot tub included in the room.
There is so many options available dont look at the norm though, it doesn't do anything be creative.
sometimes even a painting session is fun.
Be a grown up kid, do something extra unordinary, it makes me that much more enjoyable.