Reddit reviews The Bad Girl's Guide to the Open Road

Weird roadside attractions! Find all the silly little things (second biggest chair in 1981, largest firehydrant, corn palace, second largest pencil, etc) you can possibly see, just for the experience. And check out the national parks along the way.

If you're planning on going out to bars/restaurants where you stop, one thing my friend and I did was get cheap-o rings that could pass as engagement rings so we could wear them out. I can't actually say whether we would've been bothered if we didn't have them, but it was a little protection from being chatted up and also led us to spend hours giggling and developing back stories of our hypothetical fiances.

Also, I received The Bad Girl's Guide To The Open Road as a gag gift when I turned 16 and I've just always kept it in my car. It's a bit of practical advice but mostly fun anecdotes and games along the road which are at the least entertaining to read to each other as you drive if you're not solo! Or just look up fun road trip games (marshmallow toss, etc) and jot some down.

Edit: just remembered, as for snacks be wary of the salt. A lot of the foods that are convenient to munch on while driving are also very salty. Dried fruit (mango! just don't eat too much or you'll have some... Emergency bathroom breaks), fresh fruit, etc are super important. I also really liked having sucking candies like werther's or jolly ranchers, they're a good way to prevent bored eating.

Audiobooks that are visually descriptive worked the best for me. I loved Ready Player One as a roadtrip audiobook if you're into 80's culture and fantasy, and a bit of a guilty pleasure The Outlander series worked well lots of romance and suspense and descriptive scenery (not something I'd ever opt to read, but it worked on the road). If you're into mythology then the Iron Druid Chronicles were good road trip listening too.

This suggestion isn't geeky in any way, shape, or form...but I had a blast reading it a few years ago.

The Bad Girl's Guide to the Open Road