A free mod for Stardew Valley, by Pathoschild.

A small beach farm, which offers a variety of different activities.

A small beach farm can be added to any map in Stardew Valley. The maps are not limited to only one island, and you can add as many islands as you want. Each island has its own sound and grass. You can configure the farm to your own needs. 

You can also create a fishing pier on your own island. It is useful for fishing. On the other island, you can plant crops and build grass.

If you are a non-English player, the translation is included in the base mod. You can contribute to the project by translating the game into your language.