You can take a taxi, of course. Or, you can take the N'EX to Tokyo Station and then take a taxi to TDR. You'll have to price out your options and see which is cheaper. If you're willing to bring your large luggage onto a subway-style train, then you can take the N'EX to Tokyo Station and then take the train to Maihama Station (TDR). It's not a long ride and the train shouldn't be crowded heading to the park at night, but you'll have to hold your luggage.