Go to Sankri village in Uttarkashi district and climb over the Kedarkantha peak there. The place is quiet and beautiful and the trek is awesome and a little difficult.
Rishikesh nainital almora ranikhet kausani would be a good choice...if u wish to do trekking go for kedarkantha or dayara bugyal or chopta chandrashila trek..
Chopta to tungnath and 7km is sari village from chpta to deoria from sari. smaller treks. if you don't want to do trek. go for bhimtal; nanital; nakuchiyatal; mukteshwar; dana chuli