A tourist attraction.
Build a bridge-crossing ride on the side of existing bridges with a nice view (hills, rivers, etc.) You get into a transparent pod and ride to the opposite side of the bridge.
Many people don’t like reading non-fiction.
Synopsize popular non-fiction books in video format – a short documentary, summarizing the book and its main points.
As a starting point for discovering new books at the store.
Create a list of books that customers can browse at your retail store to find a book they already read. For each such book list suggestions for a new book they might want to read in the following format: if you liked this book because of X you might enjoy these books…” List potential books for each identifiable quality of the book they already read.
If you like biking when traveling to a new city, this will be convenient.
Bicycle rentals at points of entry (airports, train/bus stations) delivered to your accommodations. You just pick a bike and either have it delivered to your accommodations, or even ride it there. You can also reserve online in advance.
Many countries mandate consent for taking pictures of others.
A camera app for your smartphone that allows you to record verbal audio consent before or after taking the picture and attaching it to that picture or picture series.
Push a button or voice activated.