NBR: Need suggestions for a venue for an at home reception (after a destination wedding)

My sister is getting married in a TREE HOUSE! No really, it's incredible... in Seattle... check it out if you're bored : ) https://www.treehousepoint.com/

I have been given the duty as MOH to plan the at home reception as the wedding will only be 50ish people (close friends and family)

She is letting me do what I want pretty much.... but I want to keep it with what her and her fiance like. The tree house point where they are having their wedding pretty much sums them up. Outdoor-nature, tree hugging, etc. Her fiance is from New Zealand and they do weddings much differently there.

So basically the at home reception will be more like a party to celebrate their marriage. Thinking lots of h'or dourves.... Not a sit down dinner or buffet. But lots of food and drink.

But I'm LOST on locations.Not looking for any typical "reception hall" if you kwim. It will be end of July-ish. (haven't set a date yet) I want something cool.... unique. Space will need to hold 120ish guests. I was thinking something outside with a tent... but end of July in Cincinnati? YUCK. Hot and humid, GAH.

It doesn't matter if we bring a caterer in or the place provides. Would like to keep it on the East side or within a 30 min radius....

Any ideas????????? I need help!

TIA