Community College Summer Courses?

Hello once more fellow CCers. Since I have a severely limited schedule next year and I still want to take classes that would earn me college credit efficiently, I began to consider taking community college classes over the summer? Can you please give me good suggestions of enjoyable and bearable classes to take? I am currently a junior in high school, I want to be a physician assistant in the future and I was contemplating to take something like American History or Statistics to supplement for my busy senior year schedule.