I would say a mix, do part time like investment trading that has less commitments than full time.

At least until my 2nd son has graduated and starts working...then I can "rest"

Sure but then I would like to do something that I am passionate about :)

Will probably want to be be active, whether it's work or otherwise.

But I will more likely being doing part time, temp or freelancing

Yes of course To keep the brain healthy and the monies coming

No, time to rest, travel and devote time to better things

Ok to do so to pass time and earn $ for extra holiday.

I would continue to work, and do freelance or temp jobs

Will take it easy but wont stop working. Too boring!