I also did a road trip and had a lot of mapping ideas. I collected a few links on my own website at
https://culi.page/maps/. The page asks you for your location and then plugs your lat/long into the url parameters of various useful mapping sites. Here's some of the maps I used
* GasBuddy's gas price heatmap: https://www.gasbuddy.com/gaspricemap?lat=LAT&lng=LNG&z=8
* iNaturalist to find what species are found in a radius near you: https://www.inaturalist.org/observations?lat=LAT&lng=LNG&pla...
* A map of all co-op grocery stores: https://grocerystory.coop/food-co-op-directory
* NYTimes extremely detailed precinct by precinct political map of the 2016 election: https://www.nytimes.com/interactive/2018/upshot/election-201...
* Windy.com for really detailed weather: https://www.windy.com/?LAT,LNG,5
* ProPublica's extremely detailed map of long term production of cancer-causing air pollution chemicals: https://projects.propublica.org/toxmap/#location/LNG/LAT
* EatWellGuide fills a similar niche you do: https://www.eatwellguide.org/listings?myLat=LAT&myLon=LNG
* National Wild and Scenic River System's map of rivers: https://www.rivers.gov/apps/map
Ofc there's a lot more and many more I haven't added to the site yet, but hopefully you get the idea. I have a very large collection of maps/sites that can maybe possibly be useful or interesting and would like to have a single directory to easily access all of them from.