Well, many of my fondest memories are religious, so I won't mention them. but one of the greatest feelings was when I finally finished the BSA swim test at scout camp, it was amazing and even though I was tired and sore I ran up the huge steep hill to our campground with a huge grin on my face, the stress and anxiety was gone and I was just happy and proud.
Then there was the trip to the dinosaur museum, and the vacation we took in 2011. as well as going to a friends house and watching the HF breakout episodes, then getting Furno and jawblade later that day.
And a ton of others, I had a pretty happy childhood. (yey)