I have seen this from both sides as I'm a big fraidy cat and never went on anything until I got married to a daredevil. I was forced to confront my fears by my husband and now I zipline, hot air balloon, ski, all roller coasters except the kind that give me motion sickness. Do I wish my parents had pushed me more you bet. I missed out on a lot of fun . My girlfriend's son has been to Disney every year since he was born but would never ride a roller coaster of any kind with his daredevil sister. He went with us and my son called him every name in the book to get him to ride with him and he did. Well he was 14 at the time and he had the time of his life and now rides all the time. He was afraid of the water until we made him learn how to swim. His mother could not believe it. However with very young children I would be far more cautious as they can't always process their fears in a way to understand them. I would rather find something they enjoy and introduce a little at a time or when they are ready. When they are older then I would probably try to bribe them into trying it once.