If you have regular tickets (not park hoppers) you may re-enter the park you went to earlier in the day. If you have park hoppers added to your ticket you can go anywhere after 2 pm provided you went to the park you reserved earlier in the day.
Were you not able to get a Magic Kingdom reservation? I didn’t see you list that and staying at the Contemporary you are right next door to walk in, not to mention, I feel for most people especially it’s the most must do.
As far as Chef Mickeys, that is an excellent idea, but I’m hoping you have the Disney app on your phone. Get it and get right on trying to get a reservation, it may be too late, but with continual checking, you can probably snag one, including checking when you are there. Not sure how walk up there works, but if all else fails, ask them and they will sometimes be able to get you in, but it’s a wait. But since you’re there anyway.
You want to get to the park way before it opens. Try to get there at least another 1/2 hour , but 45 minutes is better before that since they sometimes let you in early, or let you advance farther into the park. Transportation can take time if taking a bus, so consider that and bus lines.
Confused yet? Ha ha you’ll never get it all that quick even with a crash course. Just as in all of life, do the best you can and learn from it for the next trip!
Oh and we haven’t even gotten into mobile ordering quick service food yet! But you’re going to want to eat, so look into that. Try to anticipate a little when you may want to eat because it’s not just Bam I ordered and it’s ready, it can still be a good wait. You can order much earlier if that easier for you, or get it ready and then send later. Just study up.
If you are driving around at home or for work I suggest listening to some Disney podcasts and their most recent shows to further educate easier.