Besides a free Orange Julius tomorrow, you can also put on your flip flops and head on over to Tropical Smoothie cafe for a free Jetty Punch Smoothie. Offer is good to the first 500 customers who wear flip flops there tomorrow in honor of National Flip Flop Day. More details here.
Also, A&W is offering free small rootbeer floats tomorrow in honor of their 90th birthday. Offer is good from 2-8pm and I do recommend calling your nearest store to make sure that they are participating. More details can be found here.