What is a good edditing softwear for skiing / snowboarding?

i want to add music..cut parts out and them together

Adobe Premiere. It's expensive for most users, but is well worth it if you can afford it.

If you have a Mac Final Cut Studio is the way to go. It's pricey though, about $1,300.

Also iLife comes with iVideo which is more basic but still have some neat features. You can use it to dub in music and cut and move parts.