The Reykjanes peninsula is one of the most underrated areas in Iceland. It has been going under the radar until very recently but it's still an incredible region to beat the crowds and see some epic spots without having to drive for hours upon hours. You should be able to see most of these in a single day but there's one area that take a bit of time to get to (which specified in the itinerary).
PACE: It is common when people travel around Iceland that they want to see and do as much as possible during their stay. I design my itineraries in a way where you can get the most out of every day – but still having reasonable time at each location. That being said, we all travel at different speeds and you can easily stretch the itineraries by a day or two.
SUMMER VS WINTER: During summer, we have pretty much endless daylight here in Iceland. That means you have the maximum amount of time to explore and enjoy. The opposite is true for winter when the days can be as short as 4-5 hours. That means you will have less daylight and driving can also be more difficult so I recommend stretching the itineraries a day or two and slowing down just a bit.