4 hours alone together! Yikes! I can understand your trepidation! Ask him:

*What he wanted to be when he grew up
*His favorite childhood memory
*His favorite teacher in school
*The first girl he had a crush on
*His favorite type of food
*His favorite animal
*His least favorite reptile
*If he had $50,000 to spend on a friend's party, what would he spend it on (my WH said he would never spend $50K on friend, only himself - BIG surprise, lol!)

--Out of the blue stuff like that. It's fun, it's unexpected, and you can learn a lot. Warning: mood counts. If he's in a playful mood, it will be fun. If he's in a bad mood, save it until he's in a playful mood.

Have fun, learn lots, and let us know how it goes!