It's been a long time since I have gone diving. Yup, married with children syndrome.

I agree with some kind of neoprene cover. A shortie or just a vest or shirt makes a difference in comfort, even in Hawaii. My last diving was free diving and after a few hours in the water, I am happy to have it. Even happier coming out at night in a cold wind and rain.

Night diving is fun to me. And I like the Underwater Kinetics lights. Princeton Tech is ok too, but I have just always used the UK brand.

A good spear or spear gun is a good piece of gear to have too, but here in Hawaii, I think it is illegal to spearfish while SCUBA diving. Only ok for free diving.