Wow thanks for your help everyone. Yes I do plan on going to DCA for 3 days. The Plan was to go to DLR and DCA 3 times each on alternating days. I figure with rockin' space moutain and california screamin', it would make up for the lose of splash. One last thing, I know WDW has that create a light saber in downtown disney, any idea if it's at DLR too? Thanks for your help.
The amount of time you'll be there is more than enough time to fully experience everything. That's great that you'll have so much time! I think you'll find that 3 days is way more than enough time to see all of DCA. If you've been to WDW a number of times, then not much at DCA will be new to you. If you like roller coasters, though, California Screamin' is a pretty decent one. I would actually recommend adding a visit to Knott's Berry Farm. They have some outstanding roller coasters, especially Ghost Rider! Best wooden roller coaster I've ever ridden!
As far as Tomorrowland is concerned, I would say it's on a par with the one at MK. One thing that you might find a little strange about it is that the Astro Orbiter is at the entrance to Tomorrowland and it is not elevated like the one at MK. As was said before, Space Mountain is vastly superior to the one at MK. In my opinion, it's the best attraction at Disneyland. The music enhances the ride tremendously. Also the effects and ride itself are much better. Star Tours is here, as well as Honey I Shrunk the Audience and Buzz Lightyear. This Tomorrowland also has Innoventions, but it's really lame here. You'll also notice the track overhead for the old PeopleMover (TTA) which became the short-lived Rocket Rods and was then closed. The Autopia here is pretty cute. The cars are cooler and there is more interesting scenery.
Personally, I think the best land at Disneyland, far and away, is New Orleans Square. It is very well themed. I'm not really a big fan of Blue Bayou. The ambience is cool, but the food itself really leaves a lot to be desired.
Of course, don't miss the Matterhorn! The ride is very similar to MK's Space Mountain, but I think that type of ride works better in this setting.
Big Thunder is a mirror image of the one at MK. The queue for this one is much better than the one at MK.
If Splash Mountain is closed, don't be too disappointed. It is not as good as the one at MK. This one doesn't do as good a job disguising the fact that you're inside a show building. If you look up during the ride, you can see the ceiling and all the spotlights clear as day. It also is lacking some of the scenes that the MK version has.
Pirates of the Caribbean and Haunted Mansion are both considerably better here than at MK. The queue for Pirates is pretty much nonexistant, but the ride itself more than makes up for what the queue lacks.
Definitely check out the Disney Gallery. That is above Pirates, and if you are into Disney history, you'll love it. There's lots of Imagineering artwork here.
Of course, DL has the Indiana Jones Adventure, which is incredible.
Fantasyland is worth seeing, too, since it has some attractions MK doesn't have, and it's better themed than the one at MK.
Have a great time!!