I use the Fat Gheko suction mount, it's crazy strong! & a good price. I have also just got my hands on the GoPro Skelenton case which allows access to charging port on the camera, whilst keeping the camera safe
Awesome piece which is yet to arrive the post is an external microphone. I ordered a cheap and cheerful one as a started for 10. Take a listen on YouTube as the sound difference is unbelievable!! I didn't really think about it, but the stock mic is in a sealed camera unit, which is inside a waterproof case....so will sound pretty lame.