For my earliest memory, I was about four years old and me, my two year old brother and parents were at SeaWorld. I remember the play area I was in had this huge area of inflatable slides and things to climb on. I climbed to the top of the slide and slid down. I was a little scared, but I remember the feeling of adrenaline for the first time. My personality in the aspect of being adventurous is the same, and when I think of it, I'm just as charismatic now as I was then (but i definitely was shy in the middle school/high school years). Anyway, I think the reason why I remember this the most is because my family never had a lot of money and it was our first vacation, and I was just so excited for the whole thing, but this particular moment stood out since I was having so much fun.
My earliest memory is also one in which i was 4 years old. Its different from mine in that it doesnt involve a particulary exciting one-time event like yours, but it was more of being fascinated by a new food item.
My earliest memory was also related to a theme park. My parents were grad students back then with jobs that paid below minimum wage, so it was difficult to go out on vacation... but we went to Disney one day. (: I think mine was our first vacation as well.