Switzerland is an amazing place. You can visit Gstaad, a really beautiful ski town. You can check out the Matterhorn, there's a cool little town at it's base. The driving there is absolutely breathtaking as you're at the top of the mountains.
The Norther part of Italy is also really cool. Florance has incredible architecture and museums, Venice would be more fun with a significant other, but it's still pretty cool to see, the resort lake area just south of Switzerland has great hotels and there's some cool scenery.
17 days won't be enough to see it all.