He has the best location for their team meeting. All Kakashi had said was to meet him at 'the bridge.' Not specifying which.

Or that it has to be over water.

And Naruto still fits rather well in one of their later, more complicated tree forts, that most prominently features a rather ingenious bridge arching between two wings.

The best part is Kakashi's gonna have to duck to get in.

He arranges to meet up with Sasuke so he can lead his teammate there, tells Rai which tree fort he means, and sets multiple alarms so he won't be late for first day of being a Real Ninja.