Well, for what it's worth, we usually arrive at MK (staying on the monorail, thus onsite, though) between 11am and noon, and head left wheire we grab FPs for Splash Mountain (we go during the summer), head back to AL to ride PotC and Jungle Cruise. We proceed to ride HM and BTMRR (get FPs if the line is long), and ride Splash Mountain. Afterwards, we head to TL (we have teenagers, so not much to see/do in Fantasyland but we pass through it) and get FPs for Space Mountain, have a small late lunch at Cosmic Ray's, ride Mad Tea Party, Buzz Lightyear's Space Ranger Spin, and return to ride Space Mountain. We have some free time between attractions, though. By the end of it all, it's about 6 or 7pm, so we head back to hotel for dinner at a restaurant that offers a view of Wishes (California Grill, 'Ohana, or Narcoossee's).
If we're in the mood for it, we head back out to see MSEP (since it's summer, there's a 11pm parade) and ride Space Mountain again.
ETA: Forgot to mention that, if you have young ones, I'd either go right or straight to Fantasyland as this is where most of the popular attractions are. On the left side of the park, the only two that gain significant waits are BTMRR and Splash, though sometimes JC gets a 40 minute wait or so but I've never seen it in person and we last went over Fourth of July!