Sure there is. If you are staying off site, and your first park of the day is the MK, you park at the TTC parking lot. Then, whenever and wherever you finish your day, you will need to get back to your car. So you will need transportation to the TTC. So if the OP goes to DHS later in the day and stays there until it closes, they will have to get back to the TTC. And if they are at DHS on a day when it closes later than the MK closes (such as a day when the MK closes at 8:00 and DHS has EMH until 10:00), then taking a bus to the MK entrance won't do them any good. In fact, there may not be a bus running to the MK at 10:30.