Free Prix Day is just the beginning of a weekend full of racing on Belle Isle.

It is another dual, when both days at the Detroit Belle Isle Grand Prix will feature four different racing series, including IndyCar.

The gates open Belle Isle at 7:30 a.m. Saturday morning, giving fans plenty of time to get there before the first practice race for the Pirelli World Challenge that gets a green flag at 8 a.m.

There are races all day long, practically back-to-back, until the IndyCar race ends late day Saturday.

There is no public parking on belle isle. Every ticket holder gets free shuttle service from downtown Detroit. The shuttles will pick up fans at Cobo, along Washington Boulevard as well as at the Ren Cen, right below the people mover.

Fans can take the Grand Prix ferry. The service returns this year. For $10 round-trip fare gets fans from the Detroit port authority at Atwater Street, over to the island where it docks at harbor master terminal near the main entrance. The ferry ride runs from 9 a.m. to 8p.m. and a one-way the trip takes 12 minutes.

“We wouldn't have a race like this is if it weren't for the fans,” says Merrill Cain, spokesman for the Detroit Belle Isle Grand Prix.

Organizers want you to have fun, but there are a few catches. Still cameras are allowed, video recording is not permitted.

You can bring in umbrellas and strollers, but you can't use them in the grandstands. Bags and coolers are allowed so long as they are 12x12x12. You can't put glass bottles or open containers inside them. Alcohol, bikes, lawn chairs and wagons won't be permitted.

The action isn't only on the track.

“You could probably spend most of your day here and never even see a race car on the track,” says Cain.

Cain is talking about the Meijer fan zone. A large area in the middle of it all, designed to keep you entertained when the track is quiet.

“Extreme sports demos, free monster truck rides, we've got stars from the Detroit sports teams that are going to be here all weekend long,” says Cain.