There's a large-ish campus and a starbucks in the compund. You can potentially walk around as long as you like. There's a Yoda fountain in the compound. The lobby has amazing statues and originals / replicas of the light sabers used by Yoda, Luke and Vader. But beyond that, it's just offices where people work (or so I was told by the front desk lady). There's (sadly) no gift shop.
You can't just walking into ILM. You need to have an employer host you to enter the facilities. You can walk around the outside grounds.
The lobby, yes. Beyond that you have to know an employee to escort you.
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