I'm laughing hysterically at the canoes answers! Every time I go back to the parks and see the canoes going I am surprised that it is still around. They somehow convince people that doing manual labor in the hot sun with the potential of getting wet is a ride! How?? Why?? I tried it again recently after not having done it in years, in case I had maybe changed my mind, but I sadly had not. I actually do like canoeing in general, but definitely not why I come to DLR!
As for myself, I'm trying to think up some good answers but pretty much all of my favorites are fairly popular (Space Mountain, Big Thunder, Indy, Pirates, Haunted Mansion). I guess I will go with Tom Sawyer's Island. When lunch time approaches and it's starting to get too warm I like to head to the island with my pre-made PB&J and fruit for a pleasant lunch in the shade, followed by some cave exploring. I think many groups, especially with just adults, never even visit it because they assume its just for kids or they think it'll take up too much time, but I find it worth it, even without children. It's a lovely setting with some neat areas to explore.
My other strange answer is a ride that I haven't seen operational in years. The Jolly Trolley in Toontown. I don't know why, but I instantly loved this ride when Toontown first opened. Yes, I know it barely goes anywhere, and does it slowly, but it was just kind of silly how it bobbed and swayed, and it always feels good to get off your feet for a few minutes. The trolley in DCA is great for this too, if a little less fun!
Speaking of DCA, I am still mourning for Heimlich's Choo-Choo Train, and Bug's Land in general.