On the border between lower and upper Engadine, Zernez is the main gateway to the Swiss National Park.
Begin with a visit to the Park House, where you can get all the information you need and also watch an audiovisual presentation on the park.
The park itself is small (160 sq km/ 100 sq miles) and very well preserved: you could forget about the human race here, if not for the signs indicating (very clearly) the paths for forest walks.
The best time to visit is from mid-June to the end of October, when the Park House is open.
The flora is particularly varied because of the very hilly terrain, and you may catch a glimpse of such unusual animals as ibex, elk, marmots and vultures.