Ginger Island is absolutely worth the work to unlock it. There's a secret farm where crows don't spawn, and any crop can be planted there at any time, regardless of the season. There are also a lot of secrets, puzzles, and even a beach resort that can be slept in after using 20 Golden Walnuts to build it. Ginger Island adds plenty of post-game content and more space for players to expand their farm, even if it is a bit of a hassle to initially access.