Итак, начнём!
1 .so можно заменить that's why-вот почему (перевод)
2 надо исправить:
-I'm the 9th grade student.
-travelling
-This summer I'll have a lot of time
-I can stay(здесь надо написать где ты хочешь остановиться, предложение незаконченное)
-In my opinion
-не надо писать at this timeпросто This time
-Also I have an experience
Good luck
Hello, Mr. Brown!
My name is Eugene and I’m a 9th grader. I enjoy traveling and playing several sports, because of that I am interested in your summer camp.
This summer I’ll have lots of time on hand, and would like to participate for 3 weeks starting early July. In my opinion, that’s when the weather is best, which it’s highly important for outdoor activities.
I would love to do the adventure workshop, I’ve tried diving last year and really liked it. Also I have some experience in film making, so the film academy workshop sounds quite interesting. I look forward to helping other campers and learning new things .
Best regards,
Eugene.