[解析]
Dear John,
I am glad to hear that you are going to travel.Now I'd like to share my view on traveling with you.(点明写信目的)
In my opinion,traveling is a very good activity.When you get tired with your work or study and when you have free time,you can go out to enjoy the beauty of nature.You can breathe the fresh air,meet different people and make friends with them.Only by relaxing yourself will you forget your tiredness and build your health.【高分句型一】(旅游活动的好处)
In order to have a pleasant journey,you need to make full preparations ahead of time.You'd better have clear information about the weather,and bring proper clothes,a camera,some medicine for common injuries or diseases and so on.On your journey,you must pay attention to what you eat.【高分句型二】Be careful with everything everywhere in case your money gets stolen.(旅行前的准备以及旅行时应该注意的问题)
Do you agree with me?Wish you a good journey.(表达祝愿)
Yours,
Linda