Yay, how exciting! I am just back (as in landed Saturday morning) from a 5-day WDW trip with my sister, so these recommendations will be fresh.
Unlike others, I would actually caution you that 2 days at MK will be too much. Why? Because everything MK has that DL has is better at DL.
Truly, I would focus on the things that are different at MK: Haunted Mansion, Seven Dwarfes. I would suggest you do 2 days starting in Epcot so you have more changes at the Guardians Cosmic Rewind because (don't watch any spoilers, the surprise is worth it) - IT IS AMAZING! We rode it 3 times (2 with VQ and 1 paid ILL). I would have done it 3 more times if I could have.
As others have said, the time it takes to get to one place to another can not be overemphasized. Plan at least 90 minutes from leaving your hotel to arriving just about anywhere. At Caribbean Beach you have the Skyliner which is *awesome* to get to Epcot and Hollywood Studios - I never want to see a WDW bus ever again - we even took the resort boat to the Grand Floridian to catch an Uber back from MK. Highly recommend (plus you get to check out their amazing lobby).
Here are my recs for food and rides in each park for ya.The rides are what I would prioritize for
Genie+. Feel free to ask anything specific and I'll do my best to answer. This is my 5th WDW trip in the last 6 years for reference.
MK - again, one day is plenty for repeat DL visitors
must do rides: Haunted Mansion, Seven Dwarves + Country Bear for nostalgia
table service: Be Our Guest (we set at alert and got this a week before, it really is worth the splurge if you are a Beauty and the Beast fan. Ask to sit in the West Wing) or Jungle Skipper Canteen
QS: Sleepy Hollow Waffles, corn dog nuggets at Casey's Corner for a nod to DL corn dogs and cinnamon buns at Gastons. If you want to stir up trouble try the Orange Swirl at Sunshine Tree Terrace in lieu of a Dole Whip and take a side (me: team Dole Whip)
Epcot - 2 days and you still won't see all of it. It is *huge* (I believe the entire DL resort fits in one portion or something). 2 sections so 2 separate parks in a way
rides: Guardians!!!!!!!, Remy, Frozen
TS: Space 220 (*set an alert and if you only have one meal make it this one. Food, service and experience was AMAZING), lots of great options in World Showcase so think of a cuisine you might want and do that. We ate at the Creperie and it was awesome
QS: basically anything in World Showcase
Animal Kingdom - suggestion, have this be a sleep in day. I find AK to be a 1/2 day park
rides: Avatar Flight of Passage, Everest, Kilimanjaro Safari (if you don't have a good zoo near you. we are in san diego so I skip this one)
TS: Go to the Animal Kingdom Lodge and eat at Sanaa. This is a nice way to start as well - uber to the lodge then take their bus to AK
QS: Eat in Pandora, its QS but so good. I would do this over any TS in the park
Hollywood Studios - disclaimer: we skipped Galaxy's Edge to focus on the things not at DL
rides: Rock-n-Roller Coaster, Slinky Dog (you will need to try for Slinky LL at 7am, it is the first to go), ToT (even though our Guardians is better, its fun to see the original) Mickey and Minnies Railway is absolutely adorb but is coming to DL in January. Can't wait to ride it again!
TS: Sci-Fi Diner or 50s Prime Time.
QS: I don't find much QS I enjoy here cause the TS restaurants are so unique
As for order, I think it is fun to start with something new. If you are doing a park on your arrival day I'd suggest Animal Kingdom because again I feel its a half day park. Remember you can book your LL at 7am ET no matter where in the world you are - even from the plane. You don't have to enter to book them so if this is the case you can chose an afternoon return time. Personally I would do: AK, Epcot (on a day you are fresh and excited), MK (in case you need a later start on day 3 you have done most of the rides at DL and can enjoy the ambiance), HS, Epcot to end.
One more thing I think is very important: mid day break. We averaged 20,000 steps a day even taking a 3-4 hr break each day. The entire WDW resort is twice the size of Manhattan. Your legs will thank you.
EDIT: If you still really want 2 MK days I would start and end with MK. So: MK, Epcot, AK (sleep in), HS, MK. That way if you realize the error of your ways you can change your last day park reservation to Epcot and ride Guardians again. Can you tell I loved it!