I have gotten to the resteraunt probably 50 times, can jsut about do it every time. Its quite easy once you get the hang of it.... Dont splash, get speed, get into the dark skies by the first minute, get to the ocean in the last 5 seconds, then fly up again. Its quite easy compared to some other 'hard' acheivements in games
you have to die... the tower is tall, and the gap between the plane and tower is too small. work it out next time.
Do you sample these games before upload and go "ohh ahh it goes for 1min 10sec. thats long enough!