One week off in SIX YEARS??? You've gotta' be kidding! LoL Well, better now than never. I think the answer depends on WHY you're taking a week off. As a preliminary matter, many (most?) training programs (olympic lifters are who I'm thinking of here) work w/ planned "easy" weeks, so something like 3 hard weeks followed by one easy week, and repeat the cycle. Some amount of variation week-to-week or month-to-month is normal. They may increase volume each week for 4-6 weeks and then drop volume, bump intensity, and work for 2-3 more weeks, followed by an easy week or two. It's not "normal," IMO, to keep volume/intensity the same week after week after week w/out any sort of variation or break. So, IMO, taking "easy" weeks is not something to be avoided, particularly when you're pushing heavy weights.
That said, if you're taking a week off b/c you're feeling beat up/fatigued/overtrained/etc., then I'd suggest doing whatever the fuck you feel like doing. LoL If you want to play tennis, play tennis. If you want to jack off while watching Beverly Hillbilly reruns all day, do it. And if you're sick and tired of stuffing yourself like a bloated pig, take a break from teh heavy eating. One week will NOT screw you up for a year or anything. It'll be a nice mental break. With regards to nutrition, if you're just sitting around, I'd back off the cals a bit and obviously drop the post WO "shake." If your days are full of activity though, I'd be sure to keep the cals up there unless you want to lose a bit of weight.
On the flip side, if you're taking a break "just cuz," then maybe try slicing your volume in half (Zatsiorsky says something like make the easy week 60% of a normal week's volume) and go to the gym fewer times than normal. Keep the weights heavy, but do considerably less than normal. Maybe drop some assistance movements, and reduce your top working sets by 50-75%. I'd keep my nutrition the same, because muscle building does not stop immediately when you take a week off. I'd maybe guage my food intake to my activity level, but I wouldn't slice my cals in half or anything. Basically, heavy weight, low volume, maybe go to the gym 2 times rather than 4, and keep eating decently.
One week in 6 years. . . LoL I say do w/e the fuck you feel like doing, and get that fire back.