Love Vegas, been 3 times. Last time we went we didn't do any gambling at all!
Cirque du Solei Ka was seriously amazing, defo worth the money.
Lots of great shopping, miracle mile, fashion show mall and north outlets defo worth a visit if shoppings your thing.
Lots of great places to eat, can be very pricey inside the hotels though - and we're talking $8 a beer, $14+ for cocktails. However if you are gambling, then the waitresses will get you free drinks, this includes the slot machines as-well as tables.
The high roller wheel is fun, great views over the strip. We also just like mooching around the hotels, belagio especially.
Grand Canyon was great, but expect it to be extremely hot in August, that's when we went and it was like standing under a hairdryer even in the shade.
Biggest money saving tip is to use Uber rather than black cabs, they charge about a quarter of the price! Although most hotels will only let Uber pick up from a very specific point at hotel, but worth finding out where it is.
Hope you have a great time!