Since it was my brother’s birthday, we were supposed to gather in my parents’ house to have a birthday party.
>> CORRECT! 
Actually, the date of his birthday was 2 weeks ago, but we didn’t gather at that time because my brother went on a trip to Europe.
>> CORRECT! 
We were supposed to have lunch together at about 1 PM.
>> CORRECT! 
However, my wife and I departed (from home) at 1:30 PM.
>> CORRECT! 
Moreover, there was a heavy traffic jam on the way so it was over 2:30 PM when we got there.
>> CORRECT! 
My parents and brother already ate lunch so only my wife and I ate lunch separately.
>> CORRECT! 
*by ourselves
After lunch, we went to a mountain nearby for hiking.
>> CORRECT! 
It has a mountain fortress and the total of the length is about 4 Km.
>> CORRECT! 
It had been a long time since I last walked so long, so I got a muscle pain on my legs after hiking.
>> CORRECT! 
OR >> It has been a while since I last walked for a long time so my leg muscles hurt after hiking.
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