Go to Iztaccíhuatl-Popocatépetl National Park. You can see the two mountains everyday from afar, but they’re even more beautiful up close. Izta has lots of camping spots, hiking trails, and pristine waterfalls, while Popo can only be observed, not hiked (due to the fact that he’s quite an active volcano). There used to be a little hotel up there, but you can’t go that far up anymore without special permission from the Army. And anyway, when you see some of the smoky plumes and ash clouds that Popo spits out, you probably won’t want to get much closer!