Gary, you'll have a great time.
Lucy & I spent ten days traveling round Iceland ten years ago - the best trip ever!
Everywhere was an experience, chatting to the locals in the hot tubs - most villages have a free communal geothermal spa, just turn up with a towel
Driving round, the scenery was jaw droppingly brilliant and was like my physical geography text book made real. Just stunning. Sometimes we just picked a small road and followed it to see where we'd end up
My biggest tip would be that you can pretty much stop & go anywhere you want. If you want to park up & climb a glacier, go for it! Walk down into an extinct volcanoe? Sure
We stayed at so many places I can't remember now without digging the journal out, but off the top of my head, a couple of the places we stopped at were Akureyri & Húsavík was nice.
We went blue whale watching in the north too - well worth the money. If they offer you the sea sickness tablets, take them, it didn't, and this old salty dog threw chunks - very embarrassing.
Jökulsárlón is spectacular, I shot 10 reels of film just in this one spot!
Gulfoss will take your breath away & you will spend ages photographing Strokkur.
The food is/was expensive, but we found salami, bread & gravalax from the Spar shops was good value. I didn't particularly like the taste of Puffin!
Touristy & a bit pricy, but the blue lagoon was worth it too.
When the kids are older, I will definitely go back.
Have a great time.