Whenever someone wants to try and impress a few people while riding on a party bus, what they would more than likely want to try to do once all has been said and is now out of the way would be to figure out how they can incorporate their guitar playing into the party atmosphere. Acoustic guitars are most often going to be preferred here due to their versatility, but if you want to make a mark on the party that is different from what everyone else is thinking of doing then you might be better off bringing a bass guitar instead.
You see, acoustic guitars can often be rather limited is people are thinking about dancing.They are great for playing songs but a Detroit party bus is not meant to be the sort of place where singer songwriter tunes are performed. Much on the contrary, party buses require groovier music that everyone would want to start gyrating their hips to, and the thing that makes bass guitars perfect in this regard is that they have a lot of low end in them which can be pivotal to the kind of groove that you are attempting to create which would ideally result in as many people as possible getting up off of their seats and going to the dance floor to try and have a good time.
You would also come across as someone who is really different and has a unique perspective about the world if you end up bringing a bass guitar. Acoustic guitars are old news, and bass guitars are seeing a real renaissance that is making them far more popular than their tamer, less funky counterparts.