Answer:
Dear Darwin,
What's up buddy? Me and the fam are gonna go on vacation to The Grand Canyon, it's gonna be awesome! I made sure to pack my favorite chocolate bars, because I can't survive without them. My mom bought binoculars and two cameras, so we'll have plenty of photos for you to get your hands on when we come back! And dude, I promise I'll get you an awesome souvenir this time, it'll be legendary. I already have a perfect souvenir in mind, but I won't tell you! Tell Carrie I said hello! Love you bro!
- Sincerely, Gumball