For a gag Christmas Gift, a fellow co-worker of mine gave me one of those double walled, thermal type drinking mugs. It's made of see-through plastic, and between the wall is a yellow-golden liquid with white crystals in it. From a distance, it looks like a cold glass of foamy beer. She gave it to me think it would be hilarious to leave it on my desk and watch our management go bonkers. Well, we did have fun with it, to say the least.
But it eventually ended up in our travel trailer, and now I like to set it out on the picnic table, in plane site. I really does look like a glass of foamy beer, even when it's empty, just sitting there.
I've left it out in almost every park we've been too... especially those that have the No-alcohol rules. .... and I've NEVER been approached about it! Not even out of curiosity by other campers, let alone park rangers, campground hosts, or park staff.... never. I still get a kick out of it tough.
We drink an occasional wine. Always in a non-discrete cup and the bottle is never outside ... anywhere we've camped at.