Hi,
It's very difficult to get the award flights to KTM (Kathmandu) thru US or UA on Tg so please call and well in adavnce for the same.
As for hotels the Soaltee Crowne Plaza is one of the best and has the best eating joints in the city.
As for things to do around kathmandu if you let me know what types of things intrest you I can advise you on the same.
Another option would be to fly or take a bus (5-6 hrs) to Pokhra from kathmandu as the scenic beauty si better around Pokhra.
One of the ost popular activities is taking the mountain fligth which takes you very close to Mt. Everest so that you can see the peak its roughly 40-45 flight.
What time period are you planning to be there?
Feel free to message me on any more specific info you may need.