In my opinion it's like 3 countries/climates glued together - you can be on the Pacific getting sunburned at 100F+ for the morning, drive a few hours up into the high Andes and climb a 20,000 foot glacier capped volcano, then drive a few more hours and drop down into the amazon to watch monkeys swing through the trees.
I climbed 20,000 foot Cotopaxi - http://theroadchoseme.com/cotopaxi-summit
Then lived in it's shadow for months - http://theroadchoseme.com/down-time
It's a supremely beautiful country, and the people are very friendly. Highly recommend.