This is something I made up in the shower (yet again) for Mach Racing. It's based on Big Blue and Green Plant from F-Zero, but most of it is my own material.
Haven lives up to its name in many ways. For some, it is a welcome retreat from their daily life. For other, richer folk, it is a place to live in solace. For those who wish to stay away from the public eye for whatever reason, it is a welcome hiding place.
It is a beautiful planet, its biosphere preserved by law of the local government. Human settlements are few and far between, separated from the rest of the area by powerful force fields.
Because the biosphere is so closely guarded, the populace can not feed off of it. Thus, Haven imports almost all of its necessities. Thus, a few sacrifices have been made. For example, race tracks have been built within various settlements for racers to compete in, but more importantly to provide the government with much-needed income. There are currently two such tracks on the planet, but there are plans for a third.
The first is built within the capital- or rather entwines it. The track dives and meanders between the buildings and the trees. It is somewhat controversial due to the noise and the way the track is built, but this will be rectified as soon as enough money is raised.
The second is built in one on Haven's floating cities. It goes above the main shopping district, passing by the commercial sectors, strategically avoiding the residential district but staying close to it, and finally going into the ocean. The course is a huge boon to the city, though it does have its detractors.