My 3 kids and I stayed at DLH 3 weeks ago for one night (the rest of our California trip we stayed at my sister's). I booked about 3 - 4 weeks in advance, and the GC was full.
We checked in at 8:30 AM but couldn't get into the room until 3 PM. We went to DL/DCA, then back to DLH to our room at 3 o'clock (9th floor, overlooking the front of the hotel) and swim for a couple of hours. Then back to DCA, then the room at 9 PM...we had a view of the DL fireworks, so watched them at 9:30 from our balcony (about a foot deep!). Checked out at 7 AM the next day, and spent the whole day (EE at 7:30 AM until midnight!) doing DL/DCA.
A few days later, we went to DTD with my sister, and walked around the GC. It looks great, and I'd love to stay there someday, but when I have more time.