Do you have park hoppers or one day tickets? Sorry, didn't read the OP.
We don't plan to do MK the day we have Boo Bash tickets. We are staying at an EPCOT resort, so will be doing HS in the AM, leave around 3 or 4 pm, wash up, eat dinner, head to MK (leave around 5:30 or 6 pm for bus transportation). Hoping I can hop into the pool for a quick dip...I plan to eventually swim in every WDW pool