How crowded do you like your fireworks viewing to be? Will it just be you and DH or will the kids be with you? If you don't mind being super crowded and camping out for hours for spots by the castle, then watch the fireworks from there. Otherwise, I'd totally go with F! We've viewed the patriotic 4th fireworks from the ROA before and loved the relative spaciousness and breathing room. We've also camped out by the castle on the 4th -- yes, great view, but overall, we prefer having more time for rides and more breathing room -- so I'd go with F!