You could try going over to Kissimmee. The downtown area is supposedly covered by free wifi. Here is the link to the map (look for "wireless map" on the left hand side of the page.).
http://wireless.kua.net/
Also the following were listed on wififreespot.com
Lake Buena Vista
Best Western Lake Buena Vista Resort - floors 16-18 - 2000 Hotel Plaza Blvd - 407.828.2424
Orlando
903 Mills Market - 903 S. Mills Ave.
Apple Store - 4200 Conroy Road
Around The Corner Coffee Shop - 6437 South Chickasaw Trail - 407/482-0066
Bear Rock Cafe - Millenia Plaza - 4696 Millenia Plaza Way Suite F-1 - 407-903-9533
Camille's Sidewalk Cafe (Lee Vista) - 6125 S. Semoran Suite #108 - (407) 852-1100
Camille's Sidewalk Cafe (Orlando Square) - 1700 W. Sand Lake Rd. Suite #D120 - (407) 859-7277
Fridays Front Row Sports Grill - 8126 International Drive
Infusion Tea - 1520 Edgewater Drive - 407.378.4675
Old Chicage Steakhouse & Grille - 1725 Alafaya Trail
Planet Smoothie Cafe - 12720 South Orange Blossom Trail - 407.859.5966
Long's Christian Book & Music - 1610 Edgewater Drive - 407-422-6934
McDonald's - Lake Underhill Road
Natura Coffee & Tea - 12078 Collegiate Way
Roccos Cafe of Thornton Park - 900 E. Washington Street - 407.246.0255
Trish's Teas - 4844 New Broad Street - 407-896-3155
Omni Orlando Resort at Champions Gate - 1500 Masters Blvd - 407-390-6664
Best Western Airport Inn & Suites - 1800 McCoy Road
Wingate Inn Airport - 5750 Hazeltine National Drive
Holiday Inn Select - Orlando - 1853 McCoy Road
Radisson - lobby area - 1724 Alafaya Trail - (407) 658-9008
Orlando World Center Marriott - lobby, Lobby Bar and Starbucks - 8701 World Center Dr - 407-239-4200
Embassy Suites - Lake Buena Vista - 8100 Lake Ave - 407-239-1144
Holiday Inn Sunspree - 13351 Kissimmee-Vineland Rd - (407) 239-4500
La Quinta Inn & Suites (Orlando Airport North) - 7160 N. Frontage Rd. - (407)240-5000
Crowne Plaza Airpoprt Hotel - Hazeltine National Dr
Sheraton World at Sea World