Disclaimer 1: This itinerary is for slow travel.
Disclaimer 2: No parties, sex tourism, or pretentious insta-luxury travel included.
I decided to experience Thailand differently, and hence I moved North or South and never stayed central.
The regions of Thailand include North, Central, South, and East (or North East).
Of this I focused on the North and South most of the time. The East is the flatlands region of Isaan with friendly locals. I skipped this because I knew friendly locals can be found anywhere outside the touristy towns and also because I was headed to Lao next and the culture of Isaan and Lao seems somewhat overlapping from what I had read.
Going North (12 days)
I started with the North - Hills, Trekking, Waterfalls, Hot Springs, Nature Trails. I skipped the hill tribes and elephants as I wanted to be a responsible traveler.