Well if this is your first visit ever, or in a long-time, you might want to do the standard tourist platter of Pashupati, Swayabhu, Bhaktapur, Patan, Dhulikehel, Nagarkot .There's also lots to explore around Thamel and Kathmandu city itself. Two restaurants I found pretty amusing were Jatra and Orleans - both in Thamel. I wouldn't be able to give you much advice on dohori and the more traditional entertainment forms - I am not sure Kathmandu has very many good places for that (but others on Sajha might know). Hope you have a good time in Nepal!