Is it okay if I admit that I'm going to accept a large bonus knowing I was quitting within a week?
Ooooh, wow, really? Why are you going to accept a large bonus knowing you were quitting within a week?
I worked really hard for it.
If you aren't going to be doing the work that the bonus is for, then it could be considered unethical to accept it. The best course of action would most likely be to put in your two week's notice or else you'll be hurting a lot of people with your actions.
Why should I care about others feelings.
Well the job is clearly not something that you care for, and that's completely fine. However, just leaving abruptly after taking a large bonus may look terrible on your resumes coming up in the future and is something you should think about.