Okay, if I remember my facts correctly from our August trip, the same bus from POP goes to both DTD and Typhoon Lagoon. During the summer TL opened at 8am (Early Morning extra hour for on prop guests from 8 to 9). So I would say as you are boarding the bus just let the driver know that you want to go to DTD and he/she should take you there after dropping off at TL. Enjoy!