Look up nag tibba trek. it's a weekend trek from Delhi. if you have time, add a day or two to make it comfortable, but if not, it can be managed in a weekend
Hey,
Here are some of the short treks you can do in Uttarakhand.
Chopta - Chandrashila Trek - 10 kms
Deoria Tal Trek - 3 kms
Nag Tibba Trek - 16 kms
Gorson Bugyal Trek in Auli - 3 kms
Kartikswami Trek - 3 kms
Kedarkantha Trek - 19 kms
Dayara Bugyal Trek - 9 kms
Valley of floweres - 17 kms