Whirly ball in Plano is fun. It is in the heart of Plano...don't remember exact address. (Between 75 and tollway.) did this with adults often great fun.
Japanese chop em up Steak place is fun with a group.
Main Event in Plano by Hwy 75 is fun. Groups can eat, bowl, play pool, etc. We have done that for someone's birthday.
scavenger hunt that starts and ends at your house. Have guests take a polarid or digital photo of what they had to do. (ie: say yo quiero taco bell in front of taco bell sign, sign "Iim lovin' it in front of McDonalds" , go to post office and act like they are just now mailing their christmas cards...)silly things and then have them meet back to show their photos or videos of what they did...It is fun and brings alot of laughs. have One prize for group who does most of the list of items.......(Five to a group: prizes could be $5 gift card to McDonalds or even just a box of chocolates.....whatever............but it is fun. We did it with a large singles group and the party turned out to be a blast. Have a start and end time and not too many items to do so they have plenty of time to get back to review their excursions.