So I have a plan for an upcoming game where I want my party to basically have to pull off sort of an Ocean's Eleven style game. They will be tasked by an important contact to steal a powerful artifact from the castle vault of a powerful and evil lord's castle during a grand ball event.
I'd rather this be an overall combat light encounter as well as we just did a rather long dungeon crawl not that long ago and players have expressed desires not to do another one for a while.
The problems I've run into:
1: I've never run a game like this before
2: Being at the level where they are at, they have a lot of magical tools at their disposal that defeat more mundane obstacles like locks.
3: A few of the guys playing have a fair bit more roleplaying experience than me, so I don't want them to just steamroll the stuff I throw at them.