maybe make a shopping bag invite, attach the gift card (or a fake one so you don't risk them losing the real one...) to it with the amount written on the card so they know how much you are giving them... and the date, time, etc.... Im no good at coming up with clever wording so I will leave that to someone else... I think $35 is plenty, especially considering that you are giving it to 4 friends, plus your daughter, plus dinner... as for pick up, I think the food court would be better... you might even skip dessert at the restaurant and get ice cream or something, then they can munch on that while they wait for their parents... I don't see a problem with expecting the parents to pick them up if you set a time to be done by, but if you aren't planning on setting a stop time I agree with christine that you should probably drive them home. good luck and have fun!