Fulham is by far the best of the away games in my view.
Wigan a safe place to go too but no pub nearby.
Fulham far and away the nicest away trip - wander through the park alongside the river to the ground. Arsenal is also OK - bit expensive but chance for your lad to see what I think is the best modern stadium in the PL. Everton's also OK - take a wander across Stanley Park to see the home of Racist FC. Norwich was always OK when I was a lad back in the '70's but haven't been there as an away supporter yet. The Fans Guide to Football Grounds is a decent overview of all league grounds and includes how to get there/ pubs/what it's like for away fans etc