Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: Enter this code for 10 free Lyfts PARX #Isn't it great to save money when you shop? #blissful #FREECAB
This tweet contains emotions: 
joy, optimism