Is the answer grammar right?

Why do you choose the place Cheung Chau?

It is because Cheung Chau is an island, where I can come

from the city and it is not expensive to enjoy a pinic with my

family members .

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lisauchow：
Why do you choose to live in Cheung Chau ?
It is because I like to live in an island away from the city and my family and I also enjoy the daily trips by ferry at a reasonable fare.

Because - cannot be used in the beginning of a sentence.
should be an island instead of a island
I would rewrite your answer as follows:
Since Cheung Chau is an island, I can stay away from the city. I can also enjoy travelling with my family and it is not expensive.

not right , but there say {with my family and not expensive.}. you can say [with my family and it's not expensive}..........