For some South L.A. residents, the excitement of Endeavour rumbling through their neighborhoods en route to the California Science Center faded when they learned that 400 trees had to be cut down.Space shuttle Endeavour's final 12-mile journey through the streets of South Los Angeles already promises to be a meticulously planned spectacle: a two-day parade, an overnight slumber party in Inglewood and enough hoopla to create a giant traffic mess.