Kathmandu: Kathmandu Durbar Square

It should be a pretty easy walk here if you are staying at Thamel. According to the Google maps, it is 18 mins walk. It has an entrance fee of NPR. 1000 but the ticket counters are only open between 7:00 - 19:00. You can enter without a ticket when the counters are closed. You won't be able to get into the museum but you can experience the local lifestyle. Go in the morning to witness the religious way the locals start their day and in the evening to experience how they relax after a long day at work.

Dining: Get a taste of local chia (tea) at Mama's tea shop at Basantapur square. For food, maybe try Festive Fare restaurant, opposite Kumari temple. Not the cheapest and not the best food but has a good view and nice vibe.

Note: A lot of temples and the most interesting parts of the palace/museum are still under construction and covered in scaffolding but there are still a few fascinating temples and places to see. Out of the three Durbar Squares in Kathmandu Valley, Kathmandu Durbar Square has the least amount of reconstruction done after the earthquake and I personally think the other two offer more things to see.