I'm usually in the situation where I'm showing people the parks for the their first visit - in these cases I always have a similar itenerary for each park....not necessarily romantic choices but practical for a good fastpass-lead structure:

Epcot: Living with the Land (having got a fastpass for Soarin)
MK: Snow White's Scary Adventures followed by Carousel - however old the guests they need to be started with a bit of Fantasyland magic.
Studios: Great Movie Ride (having fastpassed TSM)
AK: Tough to Be a Bug (having fastpassed KS)

When I'm on my own I always begin by sitting downs somewhere quiet and people-watching and just enjoying the fact that I'm there.