This coming summer, I'd like to go to waterpark again. And I want to go camping or rafting with my family. I want to be able to do the things I want to do.

Julie: In this summer, I'd like to go to waterpark again.
Correct: This coming summer, I'd like to go to waterpark again.
Explanation: Since it's not summer yet, it's better to say "this coming summer" instead of "in this summer."

Julie: And I want a to do camping with my family or it to do rafting.
Correct: And I want to go camping or rafting with my family.
Explanation: To make the sentence short, use conjunction "and". This will make the sentence simple.

** That's so nice to know that you want to do many things this coming summer with your family. I hope you'll all enjoy. Thank you for sharing it to me, I appreciate it. ^_^

~ Teacher Rachelle <3 ~