I just spent 4 days in Queenstown at the Hilton and had a wonderful stay. If you want to book a trip to the Milford Sound there are many places to do so when you land at the airport and in town. The cost is around $150 NZ per person. I also highly reccomend the Skyline Gondola and Luge for beautiful views right in Queenstown. I also notice that you are Hilton Gold. We used points for a stay after booking the base room and we were upgraded to a Suite with a lake view.