What are you planning on doing there (who with?) what do you own and what do you ride?
(for starters)
My last trip to Les Arcs resulted in 1 bent brake lever between 2 of us. Others over the 10 days (we crossed 2 chalet weeks) cooked brakes, bent chain rings, snapped spokes, bent rims etc.
We were running 150mm trail/am bikes with tough wheel sets proper brakes and rotors (180/200mm) and DH tyres.
If you know the hire bikes on offer and the spec you can decide if it’s worth getting some bigger tyres etc. personally my setup has taken a lot of effort to get right and I prefer it – it also took very little changing from my normal setup for the UK. The Les Arcs stuff (very little in the actual resort but everywhere else) was more like very long UK riding not at all like the stuff carved across Portes du Solie. The Cachette DH run is mostly not worth bothering with due to the riding elsewhere.
If your taking your own look at some dual ply minions (60a is fine) and some bigger rotors as heat build up can happen.
If you hire take your saddle with you.