Famous for tartiflette, wine and that most wonderful of winter sports (obviously all my own opinion) - skiing.
Not to mention, it's the ski resort of choice for Edina and Patsy from Ab Fab...
Is it suitable for all abilities?
Whatever your skiing/snowboarding proficiency, you'll find well-groomed, snow covered pistes to suit you!
There are plenty of opportunities for beginners and improvers to take lessons at the various ski schools as well.
Getting to Val d'Isère
Alternatively, if you don't want to fly, you could get the overnight ski train to Bourg-St-Maurice which is about 45 minutes by bus to Val d'Isère.
As a resort, Val d'Isère is definitely one of the more expensive, both in terms of lift pass costs (currently 278€ for a 6 day) and apres ski with costs to rival Switzerland, so if you're looking for a budget trip, it probably won't be here.
Tignes is a little cheaper, but I'm told it loses lots of the charm that Val d'Isère has, due to its more modern buildings.