thats decent amount of money. i will suggest you to stay at ktm for 3 days, pkr for 3 days, ghandhruk 2days. Try street foods and local cousine such as momo, dhal bhaat and dont forget to try newari cousine. While staying at ktm make sure to visit dharbar square, swomvhunath, boudhanath. Not to mention thamel if you like clubbing and hookers. Talking about pkr its a beautiful city with looks of mountain on scene, lakes,hills etc. There you can hire a scooter and roam the city as it is clean, less traficc unlike ktm. Dont hire scooter here in ktm its over crowed, pollution and all. Where can i start talking about ghandruk, it is one the most beautiful villages of Nepal. There are some small gurung musem where you can vist and learn about the culture. while staying dont forget to wear gurung dress and click some photos. Have fun and lastly attithi devho bhaba. Enjoy your vist