Hey, you're in Orléans and you don't know the "festival de Loire" ?
It's a big festival, totally free, during five days in the city center, on the river side. You will be able to see a lot of boats : more than 500 and from all over the world.
But not only boats, you will be able also to see some demonstrations, concerts and few local markets with local products (old ones too).
At then end of those days, there's a beautiful firework on the river "La Loire" : a must-see event!