pop-corn and or something to eat. don't forget a bottle of wine. arrange for your best music. good romantic songs, such as the ones on this page are excellent for such an occasion.
cruise the city. a good one to two hours of riding across the city is good. but if you have more money, take more hours and enjoy your day with your date.
while in the limousine, do anything you want. have fun. i bet you and your partner will have a the time of your life. 