Gap year is an unplanned vacation that you take after school and use to work, travel, become a volunteer for a while, or all of this together. It is not necessary that the "gap year" lasts exactly one year. It can last as long as 2 weeks or more than a year, it depends only on you.
I would choose backpacking. This is an independent travel option for those who are ready to go on a "free voyage" with a minimum of costs and travel the world with only the most necessary things and a minimum amount of money, exploring countries, peoples and themselves.
This is a great opportunity to take a break from the hustle and bustle of the city, find new interesting places, and conquer the mountains.
On the way, the backpacker spends the night not only in hotels, but also in hostels, campsites, guesthouses, as well as in the homes of local residents. He usually eats in the same place as the locals — in simple canteens and inexpensive restaurants, as well as at the locals themselves.