One thing I really like is listening to my music while camping and sitting by a fire. Hauling a boom box didn't suit me, and then having to carry a ton of CD's made it less appealing. Finding a radio station I'd listen to was another problem when camping away from home, if a station would even come in.
I found an inexpensive car stereo and marine boat speakers. What I like about the stereo is it has both a USB and AUX port. With a small USB flash drive I loaded a few hundred songs on it, and can listen to my music with no commercials. It's really nice when you can't find a radio station. A marine antenna was also added, which is just tacked to the inside top of the cabinet the stereo is in.
One issue I found with the install was placement and power. It wouldn't fit near the convertor where I could get 12V DC power easily, so it ended up in a cabinet across from the dining seats. To get power to it I had to drill holes in the floor and run wires under the camper. The speakers went in the ends of both dining seats, so those wires had to run under the camper too. They are tacked to the bottom with wire clamps.
Next was getting sound out to the fire without having to blast the rest of the campground out. I used a stereo speaker connector and wired it inside the front storage bin. Found a pair of outdoor speakers that are directional so you have to sit in front of them to hear it. I have 50' of wire for each speaker, and run the wires under the camper to where the fire pit is. Even on moderate volume you need to be within 15' to hear the stereo.
Below is how I set them out. If there is a tree nearby they get hung up with a bungee cord.