Places I'm considering visiting: * [Crater Lake NP](http://wikitravel.org/en/Crater_Lake_National_Park)     [(flights)](https://www.google.com/flights/?gl=us#search;f=ORD,MDW;t=MFR) * it's [*seriously* covered in snow](https://www.nps.gov/crla/learn/photosmultimedia/webcams.htm) during the winter months Require me to be in shape, at least somewhat: * [Olympic NP](http://wikitravel.org/en/Olympic_National_Park)