Here’s a corrected and polished version of your text: I enjoy visiting Xiamen; it’s a beautiful city by the sea. I love building sandcastles, watching the sailboats go by, and searching for shells in the sand. I always hope to see dolphins leaping out of the water, but I haven’t been that lucky yet. Sometimes, I think about learning to surf, but it seems too difficult for me, and I haven’t been able to find a suitable teacher. Changes and Tips: Punctuation: Changed commas to semicolons or periods to avoid run-on sentences. Capitalization: Corrected "i" to "I" and ensured all sentence beginnings were capitalized. Flow: Smoothed transitions for better readability. Word choice: Added variety ("think about" instead of "want to") to enhance expression. This version maintains your original meaning while improving grammar and style! 🌊😊

I like to go to Xiamen, it is a very beautiful city by the sea. I like to make sand castles and watch the sailboats go by and I like to look for shells in the sand. I hope that I can see dolphins leap out of water, but I haven't been that lucky. Sometimes I want to learn to surf, but it is too difficult for me and I haven't found a suitable teacher to teach/train me.

I like to go to Xiamen, it is a very beautiful city by the sea. I like to make sand castles and watch the sailboats go by，and I like to look for shells in the sand. I hope that I can see dolphins leap out of the water，but I have not been that lucky yet. Sometimes I want to learn to surf，but it is too difficult for me，and I haven't been able to find a suitable teacher to teach me.