Today is today. Be the best you can be today, so that you won't regret it tomorrow.
Today you may be thinking about things that you could have done yesterday but didn't.
Don't have that feeling of regret. It may follow you around for the rest of your life.
So if you want to do something, just do it!

But of course, if the things you want to do are not the most savory of things to do, maybe it's better to just put them off for as long as possible. Those things may seem appealing, but sometimes you will regret doing them after.

Okay, so maybe doing everything you want to is not the best idea in the world, but if it seems like what you want to do will not cause any trouble, then it should be all right.

Just remember that regret haunts forever.