Help improving my video editing skills

Just some few things I noticed:

Change the views up if possible - I'm not sure the situation regarding this while going, but what's to stop you from getting shots before and while you head out to sea?
Keep natural sound
For those that weren't there, there probably isn't enough to the video to make it enjoyable to watch for that long.

Honestly, the opening title just doesn't go with the video. There is nothing wrong with putting a basic text over the top of a introduction shot maybe blurred out.

 

Most of what you said I was thinking the same things. Changing the views with different angles will help keep the viewers interest. It does seem like a very small boat with not much room so that may be the issue.

Before and after the fishing trip with the participants talking about the days adventure. I would use music if its a particularly long video and need another interesting filler but not to take the place of everything else.

Yes, maybe replace the beginning with simpler text over the video.

Scrolling credits too fast to read.

 

You have one skill and that is to go out and video something of interest. Too ask for advice is a hard issue. Look at other peoples video and you will get an idea how to construct your video. What you did make in plain english is very amateur and all the help people tell you what you need to do will not improve your skill but it should make you look at it from a different angle.
Here are some pointers to get you started.
1. Once you have picked you subject go out and video it from different angles and some close ups
2. Take as much video as you can.
3. Once you have done that get back to me and i will guide you to the next step if you want help?.

 

I will add to all the others advice, to study the rule of third, this will help you to imrove the quality of the shot, so they will look more interesting. Its all about how to tell a story and keep things interesting, so taking different angle shots will do this purpose. Check about tutorial from stillmotion stuff, its a good point to start.