Course Preview?

I'm not 100% on what you are asking, but I'll try to help. Hopefully someone more knowledgeable will chime in for you. At the few tri's I've been to I don't remember something being labeled as a walk through. The day before the race they normally had a clinic at the location with tips and info for newbies and also general course information. The way they went over the course for me was just on a big map so nothing special was needed. They pointed out things like where the swim start would be, where the swim exit exit was, where to enter transition, where to exit transition, and which direction to head when you exited. Bike drop off might be available if you are interested in that, but I just prefer to bring it the morning of if its an option. If you have the time to do stuff I would wear some extra tri shorts under gym shorts in case there is a chance to get out on the course and swim or ride the course with a group. If you know the area riding the course isn't necessary. Just do whatever training you have planned wherever you want. If you don't know the course I recommend at least driving it so you get slightly familiar with it. Still not necessary because things should be well marked.

I've attended a few of these type of pre-race info sessions. Probably a good thing to attend if this is your first race, but most of the info is going to be standard race rules or nothing you couldn't figure out on the fly

Excellent. Thanks for the help. Looking forward to it.