heres the best i could do (context is its a family gathering):
Hello, (name)! Recently I have received the wonderful news i could fly down and visit my whole family. I can’t believe i get to go on an actual plane! I will make sure to take pictures and write to you daily. I will be visiting them for a full month. I am so excited, i wonder if they offer you peanuts on a plane like in the movies! I really wish you could go with me. I get to see family that i have not seen in years, some i haven’t seen since i was a baby. I am delighted to be able to have such a wonderful friend that i can share such good news with. My mom said afterwards, we get to go on *another* plane to Hawaii! We’re going on vacation too! This is really rare considering we have only been on vacation twice. Anyways, i wish you could go with me. I will see you in about a month!
Best wishes, (your name)