There are two locations at DtD, at the Guest Services offices, one on the Westside and one in the Marketplace. The Marketplace location is tucked behind the Sports/logo/ESPN shop, near the restroom. I don't know where the Westside location is. When you purchase an AP at DtD there is no need to have it activated, you will have a fully active pass, not a voucher. They will scan and store your bio readings at the first park turnstile you use it in.