I don't recommend Legoland to any adult really. I mean I guess miniland is cool, but the rides really are aimed at the younger set, but even then, they aren't even that good as kids rides anyway.
As for a Day in Disneyland,
Turn up before opening time.
There is single rider on Indiana Jones, Splash Mountain and Matterhorn....Use them! I'm not sure how many people are in your group, but I'd do those rides as singles if it means you miss out on less of the rest. You may have to ask the entry host for a single rider ticket, which you carry through to the boarding area.
Indiana Jones in partiular I have fond memories of my last visit where I rode it about 7 or so times, and got all the variants on the first scene.
I think its the best thing there too anyhow
As for the rest, yep Space Mountain is probably your #1 pick. Add to that Big Thunder Mountain, Star Tours as ones not to miss.
The other good rides, Pirates of the Carribean and Haunted Mansion and Buzz Lightyear and 'its a small world' are high capacity as mentioned, so do them later on or if you need to kill time for when your fastpass slot is approaching.
Have I missed anything? The rest of the lineup include Finding Nemo, Roger Rabbits Cartoon Spin, and then about 7 or so smaller dark rides in Fantasyland. Admittedly, I dont think I've ridden all the Fantasyland dark rides. If you are pressed for time, give a couple of them a go at least, but personally I found them to be very brief rides and you move quickly through the scenes...There's a bit of "was that it?" with some of them.
If I was looking for rides to be the lower end of priorities, Autopia, the Monorail, Winnie the Pooh and the Teacups would be it. Probably the train and riverboat too.
Im not sure if I'd recommend doing DCA and DL in one day anymore, since DCA is so much more fleshed out.
You could probabl