Wanderlog for the win!
I finally talked my wife into going back to Iceland in October, spending most of our time in the north and east due to her getting covid during that segment the first time we went. I've been using an app called Wanderlog to plan my trip and it's a great tool. They actually just sent me an alert that the hotels I already booked were now available at a cheaper rate, so I was able to cancel/rebook and save $200! That's going to be lagoon/hot dog money now! It's actually a cool app the way it tracks car rentals, bookings, how much money you're spending, and plots all of your stops on a map. I've used it during my past two Iceland trips as well as when I went to Finland. Just thought I would share this helpful tidbit if you're struggling to keep up with your itinerary. Can't wait to go back!