The Brookstone Waterproof Speaker can provide you with booming beats in and out of the water. It's submersible up to 3 feet. It is Bluetooth enabled, so it can be paired up with your smartphone or tablet.
Brookstone Waterproof Speaker – you can’t stop the beat
I love that chalkboard walls have become popular. I think this looks very sleek and modern, but I also think that it would make the space seem more depressed. Just consider unique uses of chalkboard and wall though--this is interesting around he bar area!