If you want to settle on the coast and are looking for a personal project to embrace a highly recommended lifestyle, a good way to start is by working on a project in a sector that excites you. The idea you have about things changes when you tackle them physically, and unforeseen situations and scenarios arise that you won't know exist until you experience them. One way to do this is to offer yourself to the best projects you can learn from, as a volunteer, or if they don't accept you, start as a client. You'll undoubtedly gain a much-needed business perspective.
A diving school, a purification plant, a vacation rental home, a beach bar... choose what you believe is your vocation and experience it before investing your own time and money to confirm it's what you're looking for.
Work is where we will spend 70% of our lives, so choose your vocation, what makes you get up every day with excitement.
Learn and grow from the ground up by learning from others until you become a professional in your sector and climb to your goal.