Well I got the job...but am I happy?

After a month and a half of 7 interviews, I finally got the "official" call last night that the American Business Woman's Association was going to offer me a job!!
Woo Hoo! Right?
Well.....
They offered me a part time job in ...SALES....
Hmmm.....
I knew I was interviewing a job in sales, I was also interviewing for a job in Marketing and also Event Planning. I knew they wanted me. Bad. I was the only one they kept calling back to see if they could find a place for me. I even mentioned at one point that perhaps the sales job sounded more interesting than the marketing one.....I dunno, they confused me with a zillion calls, and going back to the office every other frickin' week!
*sigh*
They never said anything about part time for Chrissake.
Still, tho....I'll be making more money than my lovely no-brain using job at GE. And I'll only be working 3 days a week too! I'll have time to go to the gym (yeah right) or join a yoga class (bought a new mat, havent taken it out of the box) or to sit around on my ass for four extra days.
So, the choice is....work hard for 9-10 hours a day, 3 days a week and make 100-150 more a week...
OR
work not hard at all, for 8 hours a day, slack off, blog, read the paper and make less money and work 9-5?
Hmm.....

what would you do?

I start next Tuesday.