Determine who your main online competitors are. Research how they work, how they market and how big of a market share you believe they have. Sign up for e-newsletters, research their press releases and determine the strengths and weaknesses of each online competitor. You may even need to purchase something from them in order to understand how they complete their sales process.
I clicked on a number of products to see where it took me. It does appear that the products are connected to Amazon but one would never know it since the product that shows is not the same as the listing on Amazon.. I have started a site using Amazon Affiliate products and when a visitor clicks on a product on my site it takes them to the product listing on Amazon which looks totally differenet than the Gear Patrol listings.
You can find the high ticket affiliate programs here. By contrast, those could be super expensive items, but I haven't taken into account the percentage they pay. Would you rather make 60% of $100 or 1% of $60,000? Same thing! So what you promote really depends on your interest, but these two categories of affiliate programs are great for inspiration.
Obviously with such a hugely valuable niche where people will be spending on average around $30,000 to $60,000 on a boat, there will be tons of information and reviews available, right?  Wrong!  In fact, MOST of the boats that I was interested in had zero reviews to be found anywhere on the internet.  Zero.  And all the manufacturers showed was a few pictures, sometimes a sales video, and an abbreviated spec sheet.  That’s it.  I scoured the internet for unbiased reviews of boats and did not find anything helpful at all.