If you're looking for not-so-crowded, peaceful hill stations, then head to Landour, a small town named after a village, Llanddowror, in the southwest Wales. Unlike Mussoorie, Landour is a quiet, charming place.
Rokeby Manor, La Villa Bethany and Doma's Inn are a few of many beautiful options to stay in when at Landour. Indulge in momos at Doma's, pancakes at Anil Uncle's shop at Char Dukan, eat a Swiss meal at The Stray Dog, sip on cuppa while you try hard to choose from the delicious range of baked goodies at Landour Bakehouse or buy some lip-smacking preserves and cheese at Anil Prakash Stores in Sister's Bazaar.
If this doesn't interest you, just get lost in the woods and have a little picnic of your own. And if you still want something more, then head to Cambridge Bookstore on Mall Road, Mussoorie on a Saturday to meet Mr. Ruskin Bond.
This place is getting commercialized with every passing day, so explore this beautiful soon. I would suggest to visit this place during the off season and get mesmerised by the old-town charm.