This is the circuit I personally drive on whenever I want to flog my car (or someone elses?) around, and not go too far. I found the roads for this track in 1994, one late summer night, when all the roads in this area were virtually deserted (i.e. 2am). Yours truly was wandering about in his Honda Accord and decided it was the best available road course in the area.
Sure, we've all got the tempation to make another Nürburgring out of city or country roads (more on that another day), but to keep this practical, the total length of the circuit is about 3.3 miles around.
Descriptions:
1) Start/Finish line. This is US 1, where it happens to be 3 lanes wide for a short period of time; a median in the middle is a perfect barrier against the other three lanes, which would make for a pit lane. Lots of financial buildings and other recently-constructed towers make for a nice skyline view to the heart of the city.
2) This turn leads onto Mizner Blvd.; so named for a weathly family that inspired a lot of architecture in these parts about 80 years ago to Boca Raton. It's a gentle turn onto this "loop" road.
3) Mizner Boulevard is bordered by nice-looking "European-style" row homes in this part, with palm trees as avenue planters in the middle. A shady section to block out the sunlight.
4) You turn right here onto Royal Palm Road, a narrow chute with lots of nice 1920 to 1940s-era fashionable homes in the area.
5) A little break onto 5th Avenue to slow down the cars.
6) This is Palmetto Park Road (I normally avoid driving down section 4 and 5, since the speed limit is just 25mph, but this is a concept, anyhow). It's quite wide here, with lots of quaint shops full of art and other knick-knacks bordering the road.
7) A drawbridge here (the first of 3) provides some elevation. You could "get air" here if you were using this as a video game track. Along the straight, it dips down, but then rises slightly to Section 8.
8) Hard braking for Ocean Blvd, right in front of South Inlet Park, a great place to stick your feet in the sand and watch the ocean.
9) Famous State Road A1A, a guaranteed scenic route anywhere in the state. Lined with high-rise condos and some very expensive houses (the people who can afford any of the cars in the game). You just might hear the waves...
10) The long straight is interrupted by a sharp elevation rise for the narrow drawbridge (so this is why this track wouldn't really work in real-life...) which also makes a blind ess-bend. You're now about to go steeply downhill. Whee!
11) Shortly after negotiating the ess-bend, you make a hard right turn that's not quite a hairpin (maybe a three-quarter hairpin), but still enough to load your right side with some serious g-forces in any car. You're certain to squeal the tires through here in a road car.
12) The road wanders a little to the left and right here. Nothing difficult. Australian Pine trees and few little apartments and bungalows in this region.
13) Another narrow bridge here.
14) Traffic circle, except it's not very much used to go anywhere but across. The Boca Raton Country Club is on the right, but the only elbow-rubbing you're doing is when you make a hard right and then left around the trees in the middle. (Aren't traffic circles great when there's no traffic?)
15) Camino Real. 1960's-era homes with wide yards and a wide street that bends just slightly left and right.
16) A right onto Federal Highway completes the circuit, across from the nicest Publix Supermarket you've ever seen.
Herrman Tilke, eat your heart out.
theres also one road i forget where but its near wales, that you go flying down this big hill and around this real sharp hairpin (pub on the corner 
) and then up this real steep hill and up and down and up and down and round and round and... 
