Shibuya is like Shinjuku's more polished younger brother. While the crowd is younger than that of Shinjuku, there's still a ridiculous amount of options in terms of things to do, including checking out the famous crossing.
Shibuya has a nice variety of ramen and a large number of ramen shops with tables...perfect if you're in a larger group!
Ramen in the area:
Press on the bowl to read more about it!
Mensho San Francisco