February to May season is at best. Also go in monsoon.
From Delhi, take train or fly to Dehradun (5 hrs). Take Taxi for Uttarkashi (5 hrs).
30°43′48″N 78°27′0″EMap of Uttarkashi The best way for getting around in Uttarkashi town is by walking. If you are staying near the bus station where most of the hotels are located, you can easily walk to the city center in 5 to 10 minutes. The town is so small that you don't really need transport to move around but if you want to visit the nearby tourist spots you have can either use the public transport or hire a taxi.
30.7378.451 Chaurangi Khaal. A small town located at a lower pass in the Himalayas. It is not far from Nachiketa Tal Lake.  30.8603178.5841752 Dayara Bugyal. A high-altitude alpine meadow, locally referred to as 'nature’s own gardens'. A bugyal can be flat or sloped, and are carpeted with green grass and seasonal flowers. They also provide an excellent grazing ground and pasture for tribal herdsmen.  30.89805678.5245553 Dodi Tal, e-mail: email@example.com. Beautiful lake in the lap of high mountains, surrounded by tall majestic oaks — the deodars. The lake is full of rare trout. The lake is also the source of the Assi Ganga River, which is tributary of the Ganges. The trek to Dodi Tal starts at Sangam Chatti (Kalyani), which is 11 km from Uttarkashi city. The trek's length is 22 km one way.  30.9267879.0807894 Gaumukh. Gomukh is 18 km from Gangotri in the foot hills of Bhagirathi at a height of 4255m. It is the snout of the Gangotri Glacier. The Bhagirathi river here is pretty speedy. Around the snout, nature presents a wild topography. There are bolders scattered here and there with some pieces of broken snow, along with the hard clayey snow of the glacier. The Gomukh snout is rapidly moving backwards. According to the modern research the snout has moved 1 km in just 70 years.  30.7378.455 Saat Taal (Sat Tal, Sattal, Hindi for seven lakes). Set amongst dense forests of oak and pine trees, Sattal is one of the few unspoiled and unpolluted freshwater biomes in India. These lakes are a paradise for migratory birds. It is home to a few camps being operated mostly by local people catering to tourists looking for outdoor vacations  30.89516479.080046 Tapovan. A high altitude base camp in Uttarakhand. Popular with trekkers and pilgrims.