I'm a Bondi local...it is always packed with people...if you're looking for a more chilled beach hang out, check out Tamarama, Coogee or Bronte beach, all 5-10mins from Bondi.
A tip for people looking for a decent coffee shop.. if you don't already know about it, you will because most Contiki travellers find out about it - its The Grasshopper. Ask a local and they should be able to tell you where to find it.