Dinner at Saikung Village (Seefood)
Hot Pot in one of the places in Kowloon City
Afternoon tee in the peninsula or HK Intercontinental
Day trip to Shenzen (train from TST, get visa at the boarder as long as you are not british (impossible to get visa there) or american (visa cost). Buy as many famous products as you can carry, but don't count on them beeing the real thing)