你好,改正如下：
1.You, Lucy and I are on holiday. on holiday是固定词组,不能改.需要调整的是各种人称的顺序.英文的人称顺序是：第二人称先于第三人称先于第一人称.
2.There is no park near the town. 已经说了no就不必再加冠词了.There isn't a park near the town也不对,如果去掉no应该同时把a改成any,即There isn't any park near the town.但是这样挺麻烦的,还是直接去掉a更好.
希望对你有所帮助.