When is this trip happening Scott? Too many wineries to give suggestions without knowing what kind of wine you like. Napa Valley is mostly known for its Cab's but there are many wineries that have other fine varietals.
IMHO a few cant misses are:
http://www.castellodiamorosa.com/
http://www.aubergedusoleil.com/
http://www.mummnapa.com/
If you search "Napa" here there are several other places to check out.
Restaurants to try:
Mustard's Grill
Bouchon
http://reddnapavalley.com/
Would love to get together for a smoke. Just let us know when you are near.