Go shopping at the nearby HMV for movies and music. I believe there's a Starbucks across the street as well. It takes less than 15 minutes by cab or the subway (MTR), but definitely go to Mong-kok for more shopping. It's down Nathan Road, which is the main strip in Kowloon; nothing but shops. Oh, definitely check out the nightly street market on Temple Street, which is about 3 blocks off of Nathan Road. Highly recommended. Check out the waterfront at night and you will witness one of the most spectacular skylines in the world
Going there myself in August. Note to self....pick up Air Supply SACD.
Edit....wear light clothing because it will be hot and humid.