TL;DR Went to Iceland, had a good time.

Mrs Floyd and I took a trip to Iceland and Denmark, daughter Floyd joined us for the Iceland part.  Here are some highlights and observations.

Flew Wellington to Copenhagen return with Singapore Airlines. Economy, so always a drag regardless of airline.  AKL-SIN was an AirNZ codeshare where we ended up buying the extra-legroom seats at $155 each. Deffo worth it and would do so again.  Singapore Airlines have some live tv channels on the IFE and was able to watch some WC football games on the way home which was a bonus.
Copenhagen to Keflavik (KEF - international airport serving Reykjavik) return on SAS.  About 3 hours each way. Again, just another couple of flights.
All flights on time with only minor schedule changes since booking last September. This was refreshing after some fairly major disruptions on our two previous trips, and we did get a bit anxious when the (supposed) fuel crisis hit.  All flights were at least 95% full.

Had a stop-over in Singapore giving us one full day.  Guided tours aren't usually our thing but we decided to do a half day one, we enjoyed that.

The old and the new

Orchid garden

The Jewel at Changi airport

Two full days in Copenhagen. Nice city with plenty of history, felt reasonably safe. We stayed on Nyhavn and could walk to all the major tourist sites from there, we certainly got our stepcount in though.

On to Iceland, where we met our daughter at the airport, picked up a rental car to start our 11 day road-trip around the ring road.

Plenty of waterfalls and some great scenery

Some interesting churches

If it wasn't for some vegetation, a lot of the landscape looks like it could be on another planet. The second photo below isn't particularly pretty but I was fascinated that this is from an eruption that only happened six years ago.  They are in the process of building levees around the nearby town of Grindavik to protect it from future lava flows.

But the two main highlights.
1. Jökulsárlón Glacier lagoon.  Big chunks of ice break off the glacier as the day warms up to become icebergs floating in the lagoon.  They continue to melt and float out to sea and some chunks wash up on the shore at what is appropriately called Diamond Beach.  It was honestly one of the most incredible sights I've ever seen.

2. Went off the ringroad to make a two-hour round trip to Borgarfjarðarhöfn after dinner one night, pretty treacherous drive through fog an rain but absolutely worth it when we saw the puffins.  They're gorgeous.

Said goodbye to daughter Floyd at KEF as wifey and I returned to Denmark for another five day roadie. Not a huge amount to see in Denmark by way of landscapes and nature but it is green and lush.  Lots of historic towns and villages though and plenty of palaces and castles.  We were very lucky with the weather, 20-30 degrees and sunny for the whole 5 days we were there.  Nice to get some summer warmth after Iceland and before returning to NZ winter.

Egeskov Castle

Ribe, Denmark's oldest town

Frederiksborg Castle

Fredensborg Palace

Some general notes:
Iceland is very expensive, expect to pay about double of NZ prices for travel associated items, e.g. accommodation, car rental, accommodation, eating our, groceries.  Except petrol, which costs about the same as here.
Denmark was a lot cheaper by comparison but still about 130-150% of NZ prices, except for the deal I found on Europcar for the rental.
Roads in Iceland are pretty rough, to be expected somewhat I guess given the harsh climate.  The open road tends to be raised with no hard shoulder and very few spots to pull over.  Little in the way of turn-off/merging lanes for side-roads so you need to come to/accelerate from a near stop when making turns. Driving wasn't particularly enjoyable.
Public toilets are few and far between, and are often pay-to-pee, up to $3!!
Both CPH and KEF airports are bursting at the seams and don't seem to be coping with passenger numbers (and it's not even summer peak yet).  Passport queues at CPH for non-EU passport, non Schengen flights were 1.5 hours inbound and 25 minutes outbound.  Reading other forums this appears to be the norm at the moment. Little focus on passenger comfort in the gate lounges.  Worn and frayed upholstery in the old part of the airport and hard seats in the new parts of the building.  Compare that to Changi, now that's how you do an airport.

Conclusion:  Whilst we absolutely enjoyed ourselves we wouldn't class Iceland as spectacular, other than the two highlights above, and it wasn't very good value for money.  If Iceland is on your bucket list then do go, but if someone asked "where shall I go on holiday" I wouldn't recommend it as a first choice.