I just posted a long trip report. We flew home last night and are gone for 8 days. This was my 7th trip and my friends first. We had the BEST time! Here is a link to the report, as well as my packing list.
https://community.ricksteves.com/travel-forum/trip-reports/iceland-sept-2024
And yes, our 8th trip is already booked for next summer;)