We will be at HRH on a Thur & Fri night to take advantage of FOTL. We are able to visit the parks on Fri & Sat. Should we do IOA first on Fri or USF? It will be myself, DH, DS 8yo, DS 9 yo.
Crowds shouldn't matter too much because you have FOTL, but the parks tend to be busier later in the week. Thus, a Saturday will be busier than a Sunday or Monday.