I can't imagine going on a bachelor party trip for a week - but you know your guy. What are his interests? Will they be active? fishing, golfing, surfing or are they more hang out the pool and get wasted kind of guys?
I'm with this lonelygirl - a gentle nudge that perhaps a week is too long and three days might be a better choice.
I guess I am getting old I can't think of anything I would rather NOT do than go bachlorette party for a week. I would rather go to Canyon Ranch by myself.