How many lives do you think you would need to do everything you want?

I'm not in the first flush of youth, but I know there are things I would have liked to do with my life given different opportunities.  That's not to say I don't adore what I'm doing now - I love writing stories to entertain people and take them out of their everyday lives and I know I'm good at that but, if I had to choose something else to do with my life, I could be persuaded to try:

natural history and/or horticulture

furniture restoration and antiques.

Maybe that would take more than one more life.  It probably would to do it properly. What would you like to do and why, and how many lifetimes do you think you would need?  Please post your thoughts here.