depend ka ja wow...
If go out with a group of friends (let say 5 ppl), everyone take out HKD100, HKD100X5=HKD500.
you guys can go to hikiing from Pokfulam to the Peak or from Lantau island to Discovery Bay or another round....take some pix, enjoy the scenary....Then dinner in McDonald if you choose to go to the Peak...HKD30X5=HKD150. You can choose to take the bus or van to go to CWB, it costs HKD50 at most. when you arrive CWB, still have HKD300 left...you guys can go to Hagadaz to share ice cream. HKD70X3=HKD210, still have HKD90...each can get HKD18 back wow...hahaha
If go to Lautau island, have "Dai Pai Don"...or BBQ.....
If HKD100 for u urself only...well...i will save it and have dinner at home, watch TV..and sleep...hahahaha....coz if u r happy, no matter where u go, what u do, u will feel happy....if u r not happy, no matter where u go, what u do, you will feel sad...if it s the case, better dont waste HKD100 la...
hehehehe...........
wish it could help