When I have played my best in a tournament I noticed I was distracted from thinking about playing the tournament while driving to it.
Once I put in a CD and turned it up and it lasted until I got to the course. I was enjoying the music and not thinking about playing, looking back that helped me that day.
Another example is when I knew my then new girlfriend was going to show up and walk with me while I played the tournament. Thinking about her being there made me a bit nervous. What that did was take the edge off of being nervous about playing a tournament. I didn't think too much about my play that day because I was thinking about something else.
Neither example was planned, but looking back I do believe those distractions are what helped me play good those days. The day my new GF showed I won the tourney.
So what I would suggest is to try and distract yourself from over thinking about the tournament while traveling to it.
TOURNEYPLAYER: "I don't actually expect to win."