Based on one of your other posts, it sounds like you're staying at the Paradise Pier Hotel (PPH). So, as HydroGuy points out, you're eligible for EMH (Extra Magic Hour), which happens at both parks (one park per day). When are you going?
What to do, depends a little on what kinds of things you like to do. Thrill rides? Kids rides?
DCA (EMH Only): For my family, we would probably head straight to TSMM and do that during EMH. Then depending on the line, we would either go ride RSR or wait and get a FP for that. I haven't been to DCA since Frozen Fun started, so I'm not sure how that impacts EMH planning.
DLR (EMH and MM): This one depends on 1) when you are going, 2) whether Peter Pan is in your "to do" list, and 3) how close to the front of the line you are. Assuming you're going when Peter Pan is open and you want to ride it, then if you're one of the first families into the park, I would head straight to Peter Pan and get that one done. If you're later in the line, I would be tempted to do the rest of the FL during EMH and skip Peter Pan until later. The Peter Pan line will be long all day, so I wouldn't waste my EMH morning in line for it, when you could probably get a lot of FL finished instead.
If you're not worried about Peter Pan and/or you aren't doing the FL rides, then Tomorrowland is pretty much the only other part of DL open during MM. So I would head to Space Mountain and ride that because it seems to have the longest line of the TL rides throughout the day.