Best thing you can do as a life time experience. Been there twice, '79 and '80. Brought a BSA 650 Tbolt over from Pomgolia (England) and a mate shipped his JPN over from West Australia. That had a short and flamboyant life in 1980 exploding into a million pieces from a spectacular prang at Kate's Cottage.
Spent a month each visit. Practise week is followed by race week so there's 14 days you must be there. Get in at least a week early and leave one week later if you can afford the time. As the track is about 39 miles long, you best get to the inside region. There are numerous small roads leading to excellent viewing spots, and that is one of the main reasons foe getting to the IoM before practise week so you can suss out where and how to get around.
There are many rallys and exhibits, public transport is pretty good and if you carry a helmet you can hitch a ride no probs, people on bikes will stop for a fellow rider on foot. Its cafe racer heaven, never saw a chopper once, but maybe today there are likely to be the odd Harley looking badly out of place like a beer gut in a bikini contest.
You may also be able to hire a bike there on a day basis which would be handy. Our accomodation was a tent at one of the many camping grounds. It was all pretty basic but in those days we lived on beer and beans anyway.
When I have the means to ditch the wife and kids, I'm going to go and live there.
Mick