Welcome to the forum.

You have a lot of choice in 37¾ miles! Just plan your day well, be ready for weather changes, particularly on the mountain, and whether you need to cross the course to get where you want to go to/from.

Ballaugh Bridge normally has some excitement and you can watch from the Raven pub! I prefer twisty bits than a motion blur. Pint at the Sulby is excellent for that.

Be careful getting to your chosen spot close to road closure times, that's when most accidents happen.

If a marshal gives you instructions then obey them, better still why not be a novice marshal? that way you get really up close and personal to the racing.

Enjoy! you'll want to come back!