@alex-pierre nature is a balm to the soul for sure and offers calm to the mind even when it can't offer clarity. I too turn that way for solace, the beach, the sea, the woods, the hills, doesn't matter which, they all soothe me like nothing else can
Your boyfriend is so romantic! His idea is very beautiful and cute. But before your journey - you should read about sailing. And has he chosen a yacht? Very important to rent a comfortable and safe yacht. I know just a proven yacht service https://sailica.com/de . You can booking a yacht or boat online. It's very cool and easy! I hope you will be ok ^_^
During the day, the sun heats up both the ocean surface and the land. The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze. The sea breeze strength will vary depending on the temperature difference between the land and the ocean.