Looking at the Fernie program a few things pop out:
- 45% of participants are British, followed by 25% Aussies. 5% are North American. This looks like a majorly gap year type of program, which is fine, but may skew focus to fun times rather than hardcore improvement. A lot of improvement happens by dialing back on terrain and working on fundamentals.
- Max 7 participants means fairly large groups that won't all fit on a chair for conversation. (Not terrible but may not be extremely personalized instruction.)
- Every group has a weakest and strongest skier. A good instructor can create a good learning experience for everyone in a mixed group. The problem is when the group is over-terrained, or when participants have unmet expectations (e.g. you want a bump lesson but your compatriots only want groomers). If you have expectations upfront, state them so that you get put in the correct group. (Hint: if you say you want bumps, this will put you with stronger skiers.)
Whistler appears to have devoured their camps.
The other option for you is to consider doing instructor certification. The CSIA level 1 is available in SK and you'd probably learn a lot about skiing as well as opening up the possibility to teach someday. Assuming the course is offered at a local hill, you'd spend far less than on the Fernie trip and you'd save on vacation time. You'd also be eligible to then take the level 2 skier development training.
I've found the training that's been available to me as an instructor and through my instructor connections has exceeded anything I've ever gotten through the general public channels. (That said I've had many poor training experiences as an instructor - but at least the options multiply!)