During the toddler years, children begin to figure out how things work. They want to be independent, yet they struggle with their own abilities. It's normal for toddlers to have emotional highs and lows.
No one's comfortable when a young child has a meltdown, but tantrums ARE normal. Be firm and stay calm. To help prevent future outbursts, give a "heads up" when it's time to leave the park, keep healthy snacks available and minimize errands when your child is tired. To redirect a brewing tantrum, play a game or ask questions.