Long Distance Relationships.

I'm in one just for the summer and I have little to no worries about it. I'll be back with my boyfriend in the fall.
We talk almost every night.
Text at least once a day.
We did this last summer.
I'm planning on visiting him at least twice a month for the next three months.

Any tips or advice to get through those rough times being apart?
Anything that are do and do nots?