Hang out with the monkeys at Swoyambhu. Not the easiest place to get to with public transport and a long climb up the hill (365 steps to be exact) but once you get here, you can see the whole of Kathmandu from the top and it’s very calm up here. There are a lot of monkeys here, so be aware and hold your bags close to you. Entrance fee of NPR 200.
Getting there: 35 mins walk from Thamel but I would suggest to take a cab since you are not familiar with the roads of Kathmandu.
For more information: https://www.lonelyplanet.com/nepal/around-the-kathmandu-valley/swayambhunath