I would encourage you to do something challenging, something you haven't studied in depth or even heard of. I knew I would not be the best at it with only having a 9-week internship, but I knew I wanted to learn as much as can with my time there. I wanted to have a job where every day was different, no repetitive in and out days, this job was exactly that. The people on my team were encouraging and helpful through it all and I have accepted my full-time offer here. No job will be perfect, but if you can find one that has great people, great culture, and the ability to grow in the company that is a great start to your career.