1) Don't waste all your air on the am dive off the north point chasing hammerheads at 45m. They are shy around LL, although we did see a giant hammerhead, briefly. The reef around north point provides ample opportunity for sizable tunas, jacks, humphead parrots, Napoleons, etc.
2) The bommies around south point has lots of macro critters as well as diver friendly reef fish.
3) Be sure to have all sorts of signaling devices. They let you wander off, but the seas are big and can be rough with stiff currents.
4) If Mr Mos, the resort custodian is still there, please send my regards. He was the most friendly character I met there.
5) Take an evening constitutional down the runway, where else can you do that?!
6) Doesn't sound like your itinerary allows for a Saturday or Sunday in Kota Kinabalu, but the Shangri-la Resort in KK has an awesome weekend buffet featuring a variety of street hawker fares in a clean and comfortable environment.
7) Enjoy!