Serious warnings. 1 do not travel around Lantau on weekends. No 2, do not eat at Novotel, never ever.
What I would do is take a blue taxi from da airport to Changsha beach and hit one of the 3 something restaurants, not necessarily the one that starts with an S.
There is a Thai, free showers at the beach and a long stretch to walk. Ideal for regeneration during stopovers.
A35 brings you back to da airport but check schedule.