You really want to get away but your children are still too young to go to Las Vegas. Right? Las Vegas is no longer the haven for kids that is was once billed to be however there are plenty of things that children can do right on or near the Las Vegas strip. You say your child is a toddler, no worries; you can still have fun as well.
If you have a toddler the Discovery Children's Museum will easily keep your child busy for quite some time. The interactive museum has plenty that will amuse your child and the desert discovery area will wear your child out and get the ready for their afternoon nap. The Discovery Museum has moved to Symphony park and it is bigger and better.
I usually avoid Circus Circus, aside from Adventuredome, but recently my children have had me watching the free circus acts and you can't argue with free. For the cost of the couple of dollars at the valet my children watch a couple of free circus acts. If we stop off at Adventuredome we walk over to the Midway at Circus Circus and watch a juggler or two and some crazy clown balance on something. Not bad for free.
The Springs Preserve is off the Las Vegas Strip but it is worth the quick 10 minute drive. You toddler will run around the gardens or enjoy the interactive exhibits. While not all the Springs Preserve will work for those under 3 years old I found that my youngest was always willing to touch, feel and explore for long periods of time at the Springs Preserve.
Pick a pool with a lazy river, pop on the water wings and float around all day in the lazy Vegas warmth. Your child will not stop laughing and you'll have the time of your life as you float amongst the sun worshipers of Las Vegas. The Monte Carlo and the MGM Grand pools are fairly kid friendly and have lazy rivers as well. The Flamingo pool has a few slides where your toddler will get their adrenaline rush but it can get crowded.