I've been a resident of Las Vegas for about six years now! (my comic even takes place in Vegas lol) I also happen to not drink or gamble so this post jumped out to me.
Really, @375 was right on the money with their list. I've done all of the above and all were fun! here's some more suggestions:
-Tournament of Kings Show at the Excalibur- Very cheesy but soooo much fun plus the food is great.
-The "High roller" is the name of the "obnoxious" ferris wheel that takes you up to 550 ft at the Linq and is much cheaper to go on during the day.
- Freemont street is definitely an experience you'll remember but where you are going with a church friend, just know that it's a lot of scantily clad street performers and girls walking around in pasties for photos. lol Slotzilla (the zipline going across) is super fun too!
-Tape Face, Penn and Teller, and cirque du soleil shows are ones I've personally seen and recommend 100%
-Don't forget about the famous Las Vegas sign either! But be prepared to wait in a line.