WiGLE WiFi is probably something you might find interesting, then. Or possibly Pwnagotchi if you're looking for a more specific use case, to which another comment has linked.
Interesting. WiGLE might be good for searching for libraries and such? Maybe for "which lunch places have great wifi"? Meta observation: If a site's functionality is non-obvious and behind a login, a static preview might help potential customers gain a clue.
Something like [1] seems helpful. To learn: "for 5G, the south end of the park is much better"; "this ferry trip has good signal here but not there"; "this pretty harbor island does have good signal available along this path, but it drops off along here, and the interior isn't good". WiGLE tower locations might help with "oops - which way should I turn now to restore bandwidth?"?
Something like [1] seems helpful. To learn: "for 5G, the south end of the park is much better"; "this ferry trip has good signal here but not there"; "this pretty harbor island does have good signal available along this path, but it drops off along here, and the interior isn't good". WiGLE tower locations might help with "oops - which way should I turn now to restore bandwidth?"?
[1] https://www.cellmapper.net/ or maybe https://www.nperf.com/en/map/US/-/-/signal