Scandinavia without a car

Hello y’all, I would like to travel for a week/ten days somewhere in Scandinavia during summer . The main goal of my trip is to go on some spectactular hikes, and seeing some wonderful nature. I’d like to know what is the best country to visit in that region that has a decent backpacker scene, good hiking trails and it’s fairly easy to get around without a car ?

I have my eyes set on Norway, and Iceland but I’m wondering how feasible is it to get around without a car.

Scandinavia without a car