As the survivor of two epic All-Texas herfs hosted by the Crewe of San Antonio, I have a couple of suggestions.
1. Food. Don't let your stomach get empty.
2. Water. Stay hydrated and don't overdo the booze.
3. Pace yourself. I've found that after a while, you start losing the ability to really enjoy the fine smokes you're burning. That's a hell of a lineup you've got planned, and you really don't want to not enjoy any of them. If they start tasting the same, take a break or quit for the day.
For me, the post-herf nicophetamine eyes-wide-open-can't-sleep buzz is the bigger issue, and I've never found a way around that.
And then there's that whole needing to shave the tongue thing.....:smt118