Ok, I'm not going to quote or reply to all of the individual posts in this thread, some of which have incorrect information. I will just let you know how my retirement in the WCT/NorCal this past April went.
When you fill out your retirement packet, you get to choose your ACTUAL retirement date, and the last day you plan to work. If you don't need the hours towards the year for your Peer80, you can pick Dec. 1 as your last date of work, and put down your retirement date as Jan 15(estimate based on 6 weeks vacation). Obviously you won't need the hours since it's the end of the year. The packet then asks what fills that time, you write vacation. Your first pension check would arrive Dec. 1. This is double dipping, and nobody discouraged it, in fact they suggested it. You can also use remaining sick time to extend it further. All of this basically just extends your medical benefits. If done this way, the company has no choice but to give you these vacations, either way you're leaving Dec. 1. They have no say in the matter, you're not asking them, you're telling them...very liberating! If they said no, you're still leaving Dec.1, and getting vacation checks, no real difference.
You will be paid for any holidays that occur during that stretch. You are also accruing more vacation and sick time during those weeks. After about 3-4 months, I received a live check (not direct deposit) via NDA. It was for all remaining time you have on their books. Remember, all vacations you took this year were earned last year, so if you leave in Dec. there will be a full years worth of vacation still on the books. Same idea for sick days, and floating holidays.
Of course you could also use those vacation weeks to leave earlier then your Dec. 1 date. Then you'd be subject to vacation availability based on seniority, etc. I figured a nice 7 weeks of double dipping was a great retirement present to myself.
Sorry it's so long, tough to sum all that up in a few words. I think I hit all the points, but if I missed anything, or you have other questions, just ask.