Tropical Smoothie – FREE 16 oz Sunshine Smoothie June 15, 2018 By: SMFMcommentShare The Savings! Head over to your local Tropical Smoothie Café where they will be celebrating National Flip Flop day by offering a FREE 16 oz Sunshine Smoothie! All you need to do to redeem this freebie is to wear a pair of flip flops! Head here for more information. To find a location near you, go here.