I am a summer intern in a technical role at a company. I have one project that I'm working on, in which my manager gives me tasks/things to add to the site and I complete them. However, my manager is currently gone on a three week vacation and didn't tell me what I should work on before he left. So far, I've added some functionality and improved minor things on the site, but I've run out of things to do.
How should I figure out what to work on? My manager returns in a week, but right now I feel I'm just wasting my time (and the company's time).