I want to explain the size difference between Disney and Universal to my DH, but I want to be sure that I actually have it clear in my own mind before I try to explain it to him. We live just a few miles from Six Flags over Texas and have season passes there (so it is a good point of reference for both of us). I am picturing one Six Flags park as roughly equivalent size-wise to one of the Universal parks. So US and IOA would be like moving Six Flags Fiesta Texas up from San Antonio and plopping it down next to Six Flags over Texas in Arlington (?) How long does it actually take to walk from one park to the other? I have read several posts referring to the close proximity of the on-site hotels to the parks ... but just how close is "close"? Are they a 5 minute walk? A 15 minute walk? More? Thanks for any input.