Hey, welcome to the boards! :wave:
Unfortunately, Disney tickets aren't very accommodating outside of the standard 7/14 day passes you've already found. You can get a 2 day pass which permits
one park per day (no hopping), but this does not include the water parks option. Those are
£158 per adult (10+). I believe you can add the water park option to those tickets for an additional fee, but not 100% sure.
Disney World Tickets | Orlando, Florida | Walt Disney World® Official Site Alternatively you could buy single day park tickets at the gate, but you'd be paying
$100+ for a single day in the MK. However, this may fluctuate if the seasonal pricing structure is in place.
Car hire with Thomson, and with all the UK tour operators, isn't great. Normally the 'free' car is something so small your luggage won't even fit in the trunk so you end up upgrading at the desk, which can be steep. Also the 'free' hire does
not include fully comprehensive insurance, meaning you could be liable in case of an accident. Again, this is something they try to up-sell at the hire desk on arrival so it is best to be prepared.
Last year I took out an annual excess policy with
Direct Car Excess Insurance to cover multiple US trips in which I'd be driving. It was around
£80 for the year, and provides adequate coverage should I get in an accident.
Alternatively, you could decline the 'free' car from Thomson and book your own hire car through a provider such as Alamo (
Florida Car Rental - Car Hire Florida | Alamo Rent a Car The prices there include the comprehensive insurance cover and will be cheaper than an upgrade at the desk. Plus, you know that'll you have a vehicle big enough for your needs on arrival
Hope this was helpful!