California Vineyards

Me and my wife will be visiting the Napa valley in May 2015. What are the best vineyards to visit?

How long are you going to be in Napa.  There are some great vineyards to visit but you will find that a good number to visit is 4-6  a day.
What type of wine do you like.  I used to be a regular in napa and in fact had a cellar in my home of more that 2500 bottles of wine (most from Napa), before moving to the Caribbean.

BObK

I will be in napa for 5 days with my wife and 2 year old son.  I have really enjoyed the US chardonnays and zinfandels, but to be honest enjoy most good wines, particualry with a unique distinctiveness.  I have read good things about Kongsgaard, but understand you cannot visit the vineyard.

Any tips on how to get a reservation at the French Laundry would be much appreciated too!