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?"?

[1] https://www.cellmapper.net/ or maybe https://www.nperf.com/en/map/US/-/-/signal