Last summer I went to Lansdowne, the beautiful hill station in Uttarakhand and absolutely loved it. I have written a travelogue of this visit for the GNLU magazine, Jury’s Out. Check it out here - https://jurysoutblog.wordpress.com/2016/03/28/lansdowne-an-eco-friendly-military-town/
It was very pleasant even in the summer. I strongly recommend it to anyone planning a summer trip!