I am a 46 year old single man with no kids or pets. I really need something to do tonight. Any suggestions?

spank the monkey

A movie, ice skating, coffee and book at a coffee shop. Join a book club, a chess club. There's always the obvious that most guys do when they're board but it wont take long and you will feel lonely afterward. Plan a vacation or something and start saving for it. Set a goal.................

Being an introvert, that is rather difficult to for me to consider.

I'd shoot for a date if i were you.