How do you keep a relationship? Writing letters? Ten Points!?

[Briant]

I've known this girl for six years now- since the fifth grade. We've hung out socially a few times, and have kept in touch through texting and social media. I hate this though, because that kind of communication really seems to take the meaning out of it, and often times neither of us have time, or see the point in typing a message back because of lack of anything important to say. Anyway, I'm a junior in high school now, and she is a senior(she skipped a grade and is younger than I am). She will be graduating next year and going off to college in another state, not sure exactly where. I like her a lot, and I think she likes me. The main problem of getting to know each other better is availability, with summer programs and things on our respective schedules. I also worry about being too forward with things. So: now to the main question. Is writing her a letter a good idea? Could it make things worse? Potentially backfire? Too cliche? Any other things I could try? Writing a letter seems like an attractive option, but I want to hear your opinions first. Thanks in advance.