To my friends

Today, it's rainny. I felt very lonely and missed my childhood friends. I remember when 
we went to do mountain climbing and fishing. Long time no see you,are you ok? 好久不见。 哈哈 

You can say "Long time no see, I still hope you're okay?" OR "It's been a long time since I saw you, hope you're okay"

Whether Do you still remember me? Though we make our livings in different cities and work in different fields, you are in my mind forever. 

I look foward to hearing from you, my dear friends.