In the morning I shall write one final entry to my ancient livejournal account titling it "This is my last day on Earth. I'll be dead when you're reading this". I would afterwards book in advance to go and see a West End musical in London.
After lunch I shall make arrangements for my funeral. Later I would take my final train trip.
I would go and see the show and either enjoy it and die peacefully or die of boredom whilst I wait for it to finish.
If you were suddenly turned invisible would you (if only for a second or two) entertain ideas of voyeurism?