Hi
we were there Sept 08, bought our tickets here befor we went and were glad, the 14 day magic your way ticket is the best option as it has the park hopper option which means you can leave a park and go back on the same day i.e go back to villa etc for a rest then returne to the park in the evening or go to a different park in the evening, be careful as some tickets don't offer the park hopper option.REMEMBER you CANNOT buy the 14 day park tickets in the USA they are only sold in the UK.
I didn't find it tireing but we don't have any kids, we went to a park ev day stayed all day and night for the fireworks, broke it up midweek by going shopping then another chilling by the pool.
As for tickets to the other parks, Universal is a must and again i'd get tickets here that way your all sorted befor you go, there are 2 Universal parks and the 2 day 2 park option ticket is the best, buying here you useually get a 3rd day thrown in for free.
The other parks like Bushe? (lol) gardens i can't comment on we didn't feel the need to as Disney offered more than enough, wet n wild is on i-drive, didn't go this last time but have been before and again Disney offered enough at Typhoon lagoon and Blizzard beach, didn't need to do wet n wild.
Sea world is great worth a visit, tickets are best bought there as 1 day is enough to see it.
Shopping on i-drive is fab, outlets and all sorts, deff break your visit up with a park free day.
Weather is very hot and humid like others have said so be prepared, drinks in the theme parks were $2 for a bottle of coke/7up etc and water was $1.50, stying in disney property you can buy a refilable mug for $12 for the whole 2 week stay but you can only use that for the drinks fountains in all the disney properties (not just your own), but NOT the theme parks, drink stations are everywhere so no worries there, food is also everywhere with various choices and cost.
Parking in the theme parks if i remember was $18, can't be 100% on that because we used the wonderful disney transport which is a god send and amazing can't praise it enough and free if your stying in Disney Property.
Anything else i can help with give me a shout, hope you have a fab time I AM SO JELOUS
Jords