I'm pretty sure I've already had it.
I flew a girl from Dallas up to New York to join me one weekend when I was on assignment up there. I had met her only once before, on a 30-minute break from her RW job, to give her the airline ticket. (Yeah, I was naive, but it was a different world back then, and several friends had vouched for her.)
I picked her up at LaGuardia late on a Thursday night, took her back to the hotel, and asked if she was hungry. We walked the streets of midtown for a bit before we decided just to get some deli pizza. We returned to the room, freshened up, and got down to the business of pleasure. She was everything I imagined she'd be in the sack, and when she pulled the condom off and put Little Lance in her mouth, I realized that what I'd been hoping for in the 20+ years since puberty might actually happen. I warned her several time, but she kept on going, and I saw Jesus for the first time in my life. She looked up at me, smacked her lips, and said, "Yum."
After five more orgasms over the next three days (MSOG as a standard expectation hadn't developed at that time), we'd seen the Statue of Liberty, gone to the top of the Empire State Building, seen two Broadway shows, prowled Greenwich Village, seen a show and had dinner at the top of Rockefeller Plaza, and, of course, shopped for shoes at Macy's.
It wasn't just the sex, which was great. This woman treated me better than any girlfriend I ever had, holding hands, stealing kisses here and there, laughing at my jokes. That was the best three days of my life.
That's never going to happen again. The best I've been able to do since is a putt-putt date about five years go.

So, scaling down my expectations, my dream date fantasies would incorporate fantasies such as her obeying my instructions; an under-the-table-blowjob in a restaurant; more if I thought about it; and the phrases, "Can I bring a friend?", "That was fund; can we do it again?", "When can I see you again?", and "I'd like to see you. Why don't you stop by later today?"