I would echo the organic for dry and sintered if it’s wet.
On one particularly hot dry day in Les Gets the first year I went I was running sintered pads, 180/160mm rotors and riding the brakes a lot… I quickly became well acquainted with the feeling of brake fade. Not fun!
Larger rotors are strongly advisable, floating if you can. Also bedding in your pads before you go is a good idea. Whilst I’ve had pads last a whole week before, I’ve also worn a set down to the backing plate before in a day. So take a good supply with you.
I’d also advise taking your bleed kit with you too. Usually after a few days of alpine riding, especially if it’s hot, your brakes will appreciate some fresh fluid.