When is best poker action during March Madness?

[moosehog]

Planning to hit vegas for about a week sometime in March since i'll be between jobs. I get out there about 5 times per year, usually just to play poker. I've heard March Madness is a great, if not the best time of the year for poker action. IE lots of drunk guys taking a stab at NL like they've "seen on ESPN."
I'm an advanced NL cash game player. Will play $1/2 to $5/10 NL, maybe higher. Prefer good $2/5 deep stack action. Have adequate bankroll for most any games. I'm primarily looking for lots of action.
Is any part of March better than the other? IE 2nd week vs. 4th week. I don't follow college hoops, so i don't know what stage of the tournament draws the most people.
Any specific date suggestions would be great. Thanks.