Depends on the area you're in. Springfield had a lot of dining options, Hogsmeade also has a tavern like area to dine in, and there are several other resting areas around as well. There's an app you can download for Universal Studios and I believe you can view dining options on it, which should allow you to sit and rest without having to necessarily order food if you don't want to.
There's a dining area by waterworld. Its spanish themed and has a small water fountain. Usually a lot of available seating
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