I'll offer the perspective of global nomad. I travel quite extensively and have settled in for an Oregon beach house instead of one in Portugal, Norway, Greece or elsewhere. We looked for years, having the dream of vacation getaway directly upon the ocean. We were going to Europe 4-6x a year (really!) just prior to Covid. I'm so relieved to have a place in Oregon instead of Europe, since a Euro purchase would have been sitting vacant for this whole year. I've also had a beach house in Mexico, about a 2 hour drive door to door, and a vacation cabin in Big Bear, also about 2 hours away. Both those were very minimal financial outlays-- BB -less than 50K cash purchase/ Mexico- a bargain lease in an old beach house in an American Enclave.
My two cents, on top of the great advice upthread, is this:
1) Rearrange your lifestyle in a way that justifies the expenditure and the transit time. You're talking serious money. Yes, it's cheaper than the USA, but it's still a LOT of money for your R&R. And, you have a lot, not a house. Building is a hassle when you speak the language fluently and have a phone book. It's going to be hard from afar or done in spurts while in CR. It could take years. Seriously, years! Where are you going to stay while it's being built? Will you keep a vehicle down there? Your boards? Would the vehicle be safe? My remodels in Mex were terrible experiences and disappointing overall for the time and money spent. Thievery was common--small time stuff but all the time- I'd fill the propane tank, the neighbors would help themselves, the tank would be empty the next time I went. Some of my new stuff seems to have been accidently installed in the neighboring homes instead of mine ... all pretty typical stuff.
2)Getting there/home will take a day, including the time getting through LAX. Get Global Entry to speed things up. Your enjoyment of the house (when it's built) will have a direct correlation to how much time you spend there. A great 3 weeks isn't as justifiable as a great 12-20 weeks spent there. Will you take many small trips in a year? A few long ones? Can you work remotely from there?
3) When the house is built...Seriously consider a partnership or paid Vacation Rental manager. It will offset your hard costs and also keep activity around the premises. Bad things can happen to vacation houses while you are gone. Especially in remote areas with a wealthy tourist/impoverished community dynamic.
We sold our Big Bear cabin shortly after the pipes burst in a cold snap and hot water ran down the street for 3 days. UGH! We weren't using the cabin as frequently as the years passed, and even though it barely cost us anything ($250 a month or less in taxes/insurance/utilities'), we still hardly made it up there. For the first 6-8 years we owned it, it was the best small investment we ever made and I practically lived there. Then the kids got older, less interested, and we reassessed its value to our lives.
4) I like the post above from @Shiloh Lundahl, where the partnership is set up going in. Partners can be a pain, but also a Godsend. Even 1 other family would be helpful... maybe your surf buddies would like to buy in? Surprisingly, vacationing in a great area still can be lonely, especially if your family members don't share your love of surfing.