I was in Caviahue in 2004 and really liked the resort. It is one of the most beautiful places I have ever been with huge Araucaria Trees (monkey puzzle trees), a big horseshoe lake, no crowds, very relaxing. The snow was amazing and there was never any lift lines. This resort is a bit flatter than some of the other Argentina resorts but you can traverse to some fun parts. 3 days would be enough for the true Advanced/Expert skier but this is a great resort for families and beginners/intermediates. There are also the Copahue hot springs nearby
that are great. The scenery alone makes the trip worthwhile to Caviahue. Caviahue installed new chairlifts to get you closer to the volcano crater at the top. You can also be taken to the very top of the crater via snowcat and look down into the volcanic pool. Caivahue might be too small or flat for true advanced/experts but would recommend it to anyone else. Definitely a worthwile stop on a multi resort tour around
Argentina and prices here are a lot lower than the bigger resorts.