Hmm. In my situation, ever since freshman year I knew that languages were a priority; I decided to continue my french all throughout high school, and decided to pick up chinese 1 as a sophomore (and have continued it up until now, as a senior in chinese 3). it hasn't been easy taking it, as I've had to tweak my schedule, but it's worked out for me.
In order to take chinese 1 sophomore year along with french, I took government over the summer. It was pretty laid back, and I'm glad I did it. As a junior, I took chemistry over the summer (6 weeks!) in order to take chinese 2. as a senior, I have the most freedom in my schedule and have decided to not take physics in order to continue the second language.
My point? Yeah, it hasn't been easy taking 2 languages, but in the end it was worth it for me-even if it meant giving up my summers. As well, I believe that colleges saw I wasn't necessarily a science person (having not taken physics senior year for chinese), and respected that.