Yeah 2.30 is safe enough...it's summer/autumn so plenty of light..sunset around 7pm.
The lobster place is called lobster shack - it's basically a manufacturing plant. Nothing much to do unless you crave lobsters.
Other things to do would be Sandboarding at Lanceline, view wildflowers (during season) at the Pinnacles. That's pretty much it around that area.
Thank for the reply Fireshrine. Any comment on my itinerary?
Any changes I should make?
Day 1
Day 2 - Rottnest Island (must go)
Day 3 - Penguin Island ( must go) + Swan Valley
Day 4 - The pinnacle
Day 5 - Zoo + Aquarium
Day 6 - Jetboating + Theme park
Day 7 -