Just got back and looked at the hotels in the area, 4 within walking distance.
Of coarse, everyone knows the Renaissance Resort is literally across the street and the closest. Info is here.
http://renaissancehotels.com/dpp/PropertyPage.asp?MarshaCode=MCOSR&checked=True&Marriott_BD={B4E77A8C-D79F-43A5-AB5F-E709A411790F}
Next to it, is the Hilton Garden Inn. Info is here.
http://www.hiltongardeninn.com/en/g...ionid=VKQ5XLIRNUNZNJ31AOSMHZQ?ctyhocn=ORLSEGI
Hilton Grand Vacation Club is located at the corner of the SWF parking lot, about the same walking distance.
http://www.hilton.com/en/hi/hotels/index.jhtml;jsessionid=VKQ5XLIRNUNZNJ31AOSMHZQ?ctyhocn=ORLSWGV
Next is the Sheraton World Resort on the other side about 1 block from the parking lot. Go here, type in Orlando, then look for World because the link is so long after the search.
http://www.starwood.com/sheraton/index.html
I'd say the Sheraton is a little bit farther away than the Hilton, but not by much. It's about a 10 minute walk with kids, I'm sure they can do it.
If it was my choice and money wasn't the issue I'd stay at the Renaissance. I've stayed there and it's incredible. Scroll down my site and you can see pics of a room and the atrium. During our stay, we went back and forth a few times. If you're staying at any other hotel, you probably wouldn't run back to your room if you forgot something. Whereas, with the Renaissance, you're right there.
http://home.attbi.com/~robvia/SeaWorld1.htm
If you want to save some money, then look into the Hilton or Sheraton.