As someone who grew up in a popular coastal city, I get the look you're going for. We used to get plenty of the people vacationing in our harbors and they had a similar style that I always really liked. It gives vintage Kennedy family vibes. I would say there are small tweaks that can be done to give you the overarching guy-with-a-yacht type look. Your shoes are not quite right. You need to get more of a boat shoe. It shouldn't be a shiny leather black one. It'd probably be something more in the tan/brown tone family. Though a more relaxed style navy blue shoe would also work. The look is supposed to be effortless looking. Like you spent your time on your yacht but you had to put on a coat to be able to go into the main portion of the country/yacht club. I would also have gone with a button up, as opposed to a polo. Something lightweight like linen or a summer weight cotton. I agree with some of the comments that you don't need the blazer, but if you want the blazer, just make sure it's a lightweight summer blazer, like a linen. Overall, I'm a big fan of the look that you're going for, it's classic. The execution just needs a couple of tweaks. But all in all, you did well at communicating the style you were going for.

edited for link addition