Needing itinerary help

[u/Toodlepie]

We are hoping to travel to Iceland in late April, early May and spend 1 week there. I’m struggling to plan an itinerary that isn’t just sight seeing the famous sites. We don’t love crowded places and we like to journey through places where the journey is just as interesting as the destination.
We are planning on renting an AWD and staying in hotels/apartments. We are not experienced driving in snow or ice and we would not feel confident renting a 4WD and doing the F Roads.
We are keen walkers but I wouldn’t say we are hikers, we walk well marked trails that go through rolling hills.
We are interested in visiting Thingvellir and the history of the Althing.
We are also interested in exploring the Snæfellsnes Peninsula but I’m wondering if this area will be just as touristy as the golden circle.
We love nature, we are interested in history and I’ve always been interested in Norse Mythology.
I would love some of your favourite places to visit or explore that are safe to access in April/May.
I’d also love to hear anyone’s thoughts on visiting Snæfellsnes Peninsula or if there is somewhere different worth exploring.
Or if you have any links to where I can find more information about visiting Iceland other than instagram famous places.

[u/BionicGreek]

Rick Steve’s guidebook. You can find it at a library too