I think the key is as Tricepilot references to keep the video in the three to four minute range. This is 3:55 start to finish which helps in that department. I created a 'project' in iMovie, then created the entry/intro title and ending credit slides first.
I also believe music is key, as in picking the right music to set the tone or mood. When I was assembling this, I hadn't found a music track yet and it was boring with a capital B. I spent 20min or so at
Free Music Archive, searched a couple times with the engine they provide and found this one. I read the "use' terms and it was good to go, so I imported it and it made ALL the difference in the world.
Next, I had to choose between all stills, all video clips or a combination. I went with a combo which meant trimming the video clips for the 'best of the best' part. I shot 110 clips over the week, all in the five to fifteen second range. I only used half a dozen or so. Then it was drop them in, sequence them and add transitions. Some lent themselves wonderfully to the stills presented.
This was my third attempt at something like this, the first being a
whole bunch of stills, the second being the first time to use the GoPro and the
new cheapie DIY slider rail I built, and then this one. I'm still learning and have a long way to go. But I'm pleased with how it turned out for the third attempt.