have a blast
A metaphor that you shouldn't ever take literally. It's true meaning is "to have lots of fun". The word 'blast' originates from big. So now, when you hear somebody say "Let's have a blast!", you won't have to wonder what they mean. Because, they're trying to tell you that the next following days are going to be fun!
Example:
Tomorrow, I'm going on a Summer trip to LA. Oh my god, we're also going to the beach and having cocktails! My life will have a blast!
Tomorrow, I'm going on a Summer trip to LA. Oh my god, we're also going to the beach and having cocktails! My life will have a blast!