How can I go about improving my French for this summer?

If you can afford it, I highly recommend RosettaStone. It's been very helpful for learning German, as it covers speaking, pronunciation, reading, writing, and listening. There are no translations in RosettaStone. You would see a picture of someone waving goodbye as they got on a plane for example, and you would have to click on the option that says the French word for 'goodbye.' That way you learn the language the same way you learned your first language as a baby - through immersion in the language.