Kathmandu offers a lot of activities for people with all kinds of Interests. If you are interested in History, Kathmandu has a lot of rich history. A lot of UNESCO heritage sites lie in the capital like Pashupatinath Temple, Boudhanath stupa, Syumbhunath Temple, Kathmandu Durbar Square.
If you are interested in hiking in kathmandu then there are a lot of places around the valley that you can visit like Phulchoki, Kakani, Namobuddha, Shivapuri etc. If you like extreme adventure like mountain biking there are some amazing trails around the valley like Lakuri Bhanjyang, Chobar to Champadevi, Kathmandu to Nagarkot, Balaju to Kakani etc. If you like being in the city, then you can visit Thamel, a popular tourist destination or do some shopping in New Road.