The Har ki Doon Trek 

Delhi - Rishikesh - Uttarakashi - Kalyani - Dodi Tal - Sima - Hanuman Chatti Netwar - Taluka - Har-ki-dun - Taluka - Netwar - Mussoorie / Delhi 
Day 01: Delhi / Rishikesh
Early departure from Delhi and arrive Rishikesh in time for lunch. An ideal setting for the days ahead of you.
Day 02: Rishikesh / Uttarkashi
A drive of approx. 6 hrs after an early breakfast. Breathtaking views for the enthusiastic traveler. From flowing rivers to exotic hills, a keen eye will catch sight of the change in flora at different heights.
Day 03: Uttarakashi / Kalyani / Dodi Tal
A short drive before you set off on the trekking that awaits you the next few days. Dodi Tal is a sparkling and crystal clear lake which is surrounded by forests. The trek ascends gradually through thick forests and beautiful mountainous scenery. Anglers interest - the famous Himalayan Trouts are found in abundance in this lake. Permits for angling can beobtained.
Day 04: Dodi Tal / Sima
After Darwa Top the trek passes through a long ridge with a view of meadows on both sides.
Day 05: Sima / Hanuman Chatti
4 kms into trekking and one walks into dense forests of fur and deodar which are full of rare himalayan birds and animals. Interesting downhill routes take you to the base camp.
Day 06: Hanuman Chatti / Netwar
Panoramic scenes and the drive along the river Yamuna in western Garhwal. The region is better known for the polyandrous society.
Day 07: Netwar / Taluka
This part of the Har-ki-Dun trek over the next few days is of great interest. Motorable road under construction. The forests are rich in wildlife and is veritable paradise for bird watchers and nature lovers. The trek is through dense forests of chestnuts, walnuts, willows, chinars and a variety of conifer trees.
Day 08: Taluka / Har-ki-dun
Day 09: Har-ki-dun / Taluka
Day 10: Taluka / Netwar 
Day 11: Netwar / Mussoorie
After arrival and a visit to the Mall, spend your day relaxing in the midst of the serene hills of Mussoorie.
Day 12: Mussoorie / Delhi. 
Some other Trekking Tours
The Har-ki-Doon Trek
The Chandrashila Winter Trek
Valley of Flowers Trek 
Singalila Trek - Darjeeling
Chandratal - Lahoul Trek 
Nanda Devi Trek
Spiti Kinnaur Trek
Zanaskar Trek 
Markha Valley Trek
Kanchanjunga Trek
Rupshu Valley Trek
Lamayuru - Stok Trek via Chilling