The Suncoast hotel in Las Vegas is a decent place for families to stay from what I've read. It's a little off the beaten path located in Northwest Las Vegas but not too far to still enjoy the heart of Vegas.
They have lots to offer families. They have a 64-lane bowling alley, an arcade, movie theater, a 500-seat showroom, several restaurants including Cafe Siena and Bagel Cafe Express. They have an 80,000 sq feet casino with 2,400 video poker and slot machines and 50 table games.
They also offer full salon services, a pool, a fitness center plus they are located right next to some of the best golf courses in the valley.
Children under 15 stay free with an adult!
This place sounds great to me!