You must continue to ski.
so many ways to go about this....
imho, the easiest is to buy a rental place near the hill, and do some sort of volunteering that gets you free lift passes. Teaching lessons is the nicest since you are on the hill and getting paid simultaneously.
Tough to find the right options, but when you do, it will self sustain. You will also be able to trade weeks there with weeks elsewhere for when you get tired of your usual hill. Once paid off, the rent from two weeks per month will usually cover your expenses.
Your standard 50/2 rule will not apply. You will need to look at 100 properties before buying one. Do the math thoroughly and wait for the right opportunity.
Do not overleverage. If you do not need to buy where you are working rent as cheaply as possible. You are basically trying to buy a more expensive property than otherwise necessary, and you are commuting a lot so your time to retirement is going to increase. You have to make up for the reduced savings rate by being more frugal in other areas.
you still need to make cash to fund this habit, but there are creative ways, such as working part time/ job sharing. Limit your travel time (and costs) - eg work 21 days a month in 10-11 day stretches if possible. then take 4-5 days in a row off and head for the hill.
Look for jobs with a work from home component. (Skype and wifi can let you do quite a bit)
work a ton of overtime in the off season. Bank it for later use. Your ability to find a flexible job is probably more important than your income.
NB- until you are retired, make a point of emailing, calling or texting in occasionally on working days that you are away. It is way too easy to screw up the office politics game if you are frequently not there.
Overall, it is a worthy goal, & an achievable one, and there is no one correct answer. personally I took a season after school was done and worked on the hill to get some perspective and make plans. I am not sure that delaying the start of my career was ideal, but it was fun, and it was a simple matter of asking my new employer if they could push back my start date a few months. (They were quite happy to oblige)
Alternately, I know have some friends that bought in South America to ski there in the summers (more complex but cheaper). they sold their property here for a profit, reinvested the difference and are happily "retired". nb - the 4% withdrawal rate does not apply outside of the us, so you need a larger nest egg, and diversification to compensate for currency fluctuations. I have thought about this, but it seems a bit much for me. I also am not secure enough financially to rely only on investments and occasional freelance income which they are doing.
Best of luck. Definitely keep us posted re: your plans