THanks to regular snow fall that makes this tourist destination perfect for winter skiing in Feb. You can check out few of these places within 10-12 km of Auli :
Auli Artificial Lake
Winter Ski resort
If you can face extreme cold weather conditions, you can visit auli anytime! But I would prefer the duration between mid of april to august following the suitable weather conditions! Next, you can visit haridwar, in this The Crystal World Water Park is very massive. U can have a fantabulous experience here! Then you can visit Rishikesh for various adventure activities, Mussorie, Gangotri etc.