I will be in towntomorrow and might have a drink. If I do where is the best place to safely park a bike overnight. I have some running around to do first and I dont fancy going back home and then coming out again.

You can park it at Bali Hai, in between the automated car park and the water.There is dedicated parking for motorbikes there. But put an extra lock on for safety.

Waay too many unhelpful people on this board.

It should be "mostly" safe to park it anywhere you see a line of smaller sized bikes (ie not the 1000cc rentals along beach road)
Make sure you dont park on red/white yellow/white painted kerrb area even though others may do, the local police/council do often remove vehicles from those areas.
If your bike is very valuable maybe the place you drink at would let you park it on their premises most have CCTV now.