The problem with a 7-player group is that - if you are trying to make sure everyone gets face time - it can actually be much slower because so many people will want to get in actions. If it's a bachelor party setting, people are probably going to want to aim more on the side of "fun and casual" than "intense and brooding."
I would consider picking a set-piece scenario from an AP or Module and running something more freewheeling. Less RP, more exploration and combat. Since you've got seven people, and most published modules are for 4, the party's gonna have a lot more momentum so it could push on faster than a regular group. This is the kind of thing where an open dungeon module would be a lot of fun. Some suggestions:
(1) The Battle Market from Legacy of Fire 1: Set everyone at 2nd or 3rd level and let them fight their way through the market. This is particularly a lot of fun if you have a big map and everyone can move about in a running battle.
(2) A level of the Emerald Spire. Many of these levels can be run as a good solo one-shot for PCs of appropriate level. I can recommend Splinterden (Lv. 3) or the Tomb of Yarrix (Lv. 11) as good for standalones.
(3) The Lost City from Shore to Sea. Just plop them on the shores of the City and see how their explorations go.
(4) If you want to dig real deep, the Seven Swords of Sin was meant to be a tournament module and is goofy, lethal, and chaotic. Could be the right fit for your group.
(5) Rappan Athuk. Have them bring back-up characters. And then some back-up back-up characters.