Hi Ian and congrats on your plans to make it to SnF this year. I've attended SnF 5 times IIRC. Here's some information based on my experiences.
1. Study the satellite view of the site so you'll gain some situational awareness. I consider myself a fairly smart guy and it's amazing that I can fly an airplane half way across the country and find a strip of pavement not much bigger that a side walk but STILL have trouble knowing where I am and how to get where I want to be at both SnF and OSH. They do have maps of course but in my opinion, their maps are horrible. If you don't know where you are, you can waste time just wondering about.
2. On your first day, allow your self at a very minimum of an hour to get through each of the hanger buildings labeled ABCD. There's so much interesting things to see. Then an additional hour or more to visit the vender sites located all around in tents. It's lots of walking... so comfortable shoes are a must. You'll want to eat too so count some time for that. Take one of the maps and books with you and at the end of the day, and now equipped with a bit of working knowledge of the layout/displays/events, you'll be able to fine tune your plan for your second day zeroing in on your specific interest.
3. Transportation is pretty easy. The tram routes are color coded to let you know the general areas they go to and from. If you're interested in the RV's, take one out to the homebuilt areas. RV's are always in abundance with many friendly pilots and builders happy to answers questions.
4. The airshow is good too. Walking around, seeing all of the things associated with this event.... it's all part of our collective aviation experience. I've also discovered this and perhaps the most important part. The venders/airshow/displays are all wonderful but the best part is when you get back to the camping areas, whether its homebuilt or general aviation, the fun, fellowship and camaraderie of fellow aviators is just as much a part of the event as everything on the other side of the fence.
I too am looking forward to another exciting few days at SnF Weather permitting, I'll be in homebuilt camping.
Enjoy the show!!