Monster: By July of 2013, you have completed swim lessons, did Soccer Shots for 3 sessions, played 2 years of t-ball and 1 year of coach pitch, went to soccer camp 2 years, have gone to VBS 3 times (this is not including the one you will be attending this month), ran the Run 4 Fun twice, gone to Camp Invention for 2 years, done Young Naturalist Camp, attended Sunday School, participated in every reading program at the library since you were 2, had art classes (and, sorry to say, I tossed most of those projects, too, but I did take pictures of them for you), started karate, and I'm sure there are a few things I can't remember, but you can always ask me if you did it and I'll let you know.
Sunshine: By July of 2013, you have made it all the way through the highest level of swim lessons you can until you are 5, did 3 sessions of Soccer Shots, played one year of t-ball, attended one VBS, attended Sunday School, did art class (same comment as on your brother's art class stuff), attended a year and a half of music class, participated in every library summer reading program since you were 1. You are only 4, so your list may not be as long as your brother's but I'm sure we'll be adding to it. Like with your brother, I may have forgotten something, but you can always ask me.
There you have it, Thing 1 and Thing 2. You participated in all those things. Look, we didn't even need to cut trees down for it. I'm so proud of both of you for always being willing to try new things and stick them out, even if you don't like them. The experience you have gained from these activities is worth far more than a sheet of paper saying you did them. And, for the record, you both actively participated in all activities you have ever been in, even when they weren't your favorite.