Everyone out there is different, and so is everyone's job decision. You can't compare the job as a ski instructor with a regular office job, that's for sure. But I'm also pretty sure you can't reach a ski instructor with someone who has an office job and sits in front of the computer from 8 o'clock until 5 o'clock.
Being a ski instructor means to be open minded and feeling well
As a ski instructor, you love nature, the mountains, the snow, and being outdoors every day. Ski instructors are keen to meet new people and aren't shy about talking to strangers. Furthermore, specific social skills are required as the guests have to feel welcomed, heard and happy. It is essential to be trustworthy and prepared for every situation that might occur where the guests could feel unsafe or overwhelmed. Basically, you're the one person responsible for your guests on the mountain, and within that time, you need to ensure that everything goes well and works out as the guest wishes. Ideally, a comfortable environment comes up the better you get to know each other, and the other joke shouldn't be missed.
Thinking about a regular office job, I guess the work doesn't have that much variety and fresh air, to say the least. It is more of a static and quiet work environment, even though office jobs depending on the position and field of work, can be super stressful. But the kind of stress is another one, I would say. It's more based in your head and not so much connected to sports and body movement, and there are extreme situations concerning the success or prosperity of businesses or transactions made. It's not so much related to the wellbeing of another person, nor their personal improvements. In an office job, I would say everyone works for the company's sake and even though personal achievements are significant, what counts in the end are numbers and the company's goals.
If one can't decide what job to choose, I advise working in an office part-time and as a ski instructor the rest of the time. This way, you can make the most out of the two somewhat different jobs, and you have the most incredible variety, and who knows, maybe you grow more in one position thanks to the other and vice versa.