For example, a bias could be if your prediction of how much you will enjoy X is systematically smaller than how much you actually do enjoy X when you are doing it.
So what you're asking is if people are good at maximizing their own happiness?
We are not. Our happiness is set up to make sure we maximize inclusive genetic fitness. Rather than fixing a bias, evolution can simply account for it. For example, the joy of sex does not compare with the discomfort of pregnancy, but due to time discounting, it's enough to make women want to have sex.
As for what would maximize happiness, I'm not an expert. You'd need to ask a psychologist. I'm given to understand that doing things that at first appear to make you happy will tend...
Haven't had one of these for awhile. This thread is for questions or comments that you've felt silly about not knowing/understanding. Let's try to exchange info that seems obvious, knowing that due to the illusion of transparency it really isn't so obvious!