Is this purely a Coaster pilgrimage? Have you done any Disney parks before? Disney parks are worth the trip - but Florida is going to need a heck of a lot more time to get around it all than California will - if Coasters are your aim, Cali can be done in a day, and 2 days will cover almost everything (i believe 3 is necessary) - WDW by all accounts requires far more time to 'do it right'. Whilst you're based in LA, USH & Knott's are kinda a given, and each offers their own pros and cons (again - if it's purely a coaster pilgrimage - i'd say skip USH, but don't miss Knott's. Cedar, Dollywood are also on my to do list, but I guess it depends on what sort of coverage you're going for. I'm frequently amazed at the mileage Gazza gets out of his trips, and know that I could never come close to that kind of endurance... so you need to work out precisely what you want and where. Everyone is going to have different suggestions, must-dos, and even 'theres a credit that's only a 10 minute detour off the highway that only costs $5' - for me - those kinds of "credits" aren't worth it... unless the ride itself is actually very good, and worth the stop...