Uttrakhand has Two Regions Garhwal nd Kumaun
Garhwal is famous for Chhota Char Dham nd many more Pilgrimage Sites. Thousands of Devotes from all over India Visit Garhwal Every Year.
If you want to explore Less Crowded Places then Kumaun is best. You can visit Kausani, Birthi Falls, Chakodi, Munsiyari, Pithoragarh, Mount Abbott, Mukteshwar, Ranikhet.
These are beautiful less crowded places in Kumaun region of Uttrakhand