The RI is a very nice hotel, especially for a family!
You can go to all the sights up International Blvd. because you are in a good location. Just as easy is to get to Kissimmee, and all the things there are to do there! Don't forget "Old Town", a great place to visit. It is free to visit and kids seem to really enjoy the place. There are things that will cost you to do, like, go-cart riding, bungie jumping, miniature golf.
To save some dinner money, try the Texas Roadhouse, on Sand Lake Road, or get some great fried chicken at Popeye's. One great thing about a RI, you can cook, bring carry-out and at least "Bring home leftovers"!
Have a great trip!