If there's a place I don't want to forget, I use the often-overlooked Bookmarks feature in Apple Maps on my iOS devices. It's a quick way to note favorite businesses, camping sites, and so on for future reference. To add a bookmark, you'll first find an address on your map that you'd like to remember. If it's a restaurant or other business, you can just search for its name; if you're adding a natural feature that Apple Maps doesn't have listed, press and hold on its location briefly to drop a pin.
After you've found what you're looking for, touch the arrow that appears next to your place's name or address. As I've done in the screenshot below, you can use this feature on the blue dot that indicates your current location, as well.
(On the iPad, this is the letter "i" in a blue circle instead of an arrow.)
One of the choices on the next screen is "Add to Bookmarks." Unsurprisingly, that's what you're gonna do.
Give your new bookmark a name…
…and it'll save to your list. Fancy!
To check out your saved items later, you'll just touch the Bookmarks icon that appears in your Maps toolbar.
If you look at my list above, you'll see I use this for all sorts of things—restaurants I've enjoyed (especially in other states or countries), great places to hike, a favorite vacation spot, and so on. And after writing this tip, I'm hungry for a restaurant that's a thousand miles away. Thanks a lot, guys.