Board, Embark
In your fingers are flowers which really suit you. But you throw them to the people waving to you from below, as you board your ship. The flowers fall, unneeded. You're embarking on a new life, a new journey. There will be more flowers where you're going.
Picture yourself boarding the ship and letting the flowers slip from your fingers, into the crowd of people waving goodbye.
とう
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You board a ship to とうきょう, bound for your new life, of course!
Where else would you go at this point? I mean, come on. You've made it 53 levels since you embarked on your kanji journey with us. We know you by now. You want to be in とうきょう.