My wife and I enjoy Star Wars, but are by no means hard core fans. However, we planned two days at HS on our last trip just to soak in Galaxy's Edge, and loved all our time there. Some of it was filled with droid building one day and light saber making the other time, but those were really only 15/20 minutes of our time. We made three separate Oga's reservations (if you can't get them at first, sign up for one of the dining alerts - times came through almost daily for me) - that let us try multiple drinks spread out over the day, as well as interact with different bar staff (ask them how they came to work for Oga. They all have fun stories to tell.)
There's a shopping mall with some fun stuff that you won't find anywhere else. If your phone battery holds up, there are a bunch of missions/games you can find in the Play Disney app. There's also so many hidden Easter Eggs around the land, particularly if you can translate Aurabesh (or use the Play Disney app for that too). My faves were the water fountain in the market place area, and the droids inside the Droid Depot.
We tried to dress "in universe", to let the Citizens of Batuu know that we were up for fun. We had great interactions with stormtroopers, Rey and Chewie, Vi, and several store assistants/servers/photographers etc. So between finding characters, getting all the possible photos, riding both rides each time you are there, eating at both Ronto Roasters and Docking Bay 7, trying the milk from the milk stand, hanging out at Ogas, people watching, shopping, and just your basic exploring... you are unlikely to be bored.
Photos for fun (and because we just got back and I'm missing it so badly...)
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