Should I be doing more as an intern?

First of all I started my internship yesterday and I have to say that I am relieved with how nice the people are. I did not expect this much work load because in just these two days I spent ~18-20 hours in the office and did like 2-3 hours of work home. Yesterday lowkey I was given some tasks and I was happy to help as much as I could, I was even lucky enough to be allowed in a client meeting today. Yesterday I asked for some extra work I could do home or any way I could help and I was told I could prepare notes for a client meeting that I would go over with an associate in the morning. I prepped my ass off and I would say I did a pretty good job today. I am just curious is it okay to ask for work or does it seem too tryhard? I mean if I didn't ask for anything to do I would be sitting there every time I complete the task they give me unless I was called upon so from time to time I would try to ask other analysts if I could do anything that would basically make their job easier for them (which thinking about it now is mostly going over a looot of numbers and documents). I also try to network I guess? I try to go to lunch and eat something even if I am not hungry. 

Also something more important I wanted to know about shoes. Whenever I had to dress so formal I didn't have to do it for days and hours non stop and idk if it gets any better but my shoes literally destroy back of my feet like the tendon part (Achilles tendon) and it really hurts to walk in them for like 2 hours (I gotta take a train and a bus to get to work) so like are there any pads or something anyone could recommend I could put there not to obliterate my foot?