Weekend Land Mines?

I am sure I am not alone, but the weekends can be challenging.  I try to know ahead of time what I am going to do, where I am going to go and what challenges I may face.  With this knowledge I am prepared with my water and food plans.  It's the last minute challenges.  I am further out so my restrictions are not as black and white as someone in their first year.

What do you do to stay on track and avoid the weekend land mines?