Without having to go back to school, off the top of my head I'd think: sales, technical writing, or life coaching/Personal Trainer/nutrition consultant.
What do you know how to do and what do you want to do?
With a solid science background, it may be worthwhile to do a bridge program into Nursing, Radiology Tech, Ultrasound Tech, etc. You could be able to score a degree in less time than it typically takes, then you have the freedom and mobility to earn good pay and figure out where you want to end up. I did that at 30, and couldn't be happier with the choice.