Sounds as good as could be expected with the conditions.
I have been diving with a full wetsuit and a hood, in part to avoid contact with the stingy things.
The sea life spots sound nice.
Of course the amount of lead you will need will vary with the exposure suit and rig you are using. Also, AL tanks get lighter as they empty. You probably already know all that. I thought I would mention it just in case.
As to the tummy, I don't eat anything greasy the morning of a dive or anything acidic and that keeps my tummy happy. Some people take an antacid prophylactically.
I am excited for tomorrow morning and would love to see your pics, if you post any.