Hi! I need some tips/suggestions/advice and I am turning to the best resource on the web -- DIS members!!! 
The family is staying at WDW this mid-June (as soon as school ends). We want to take 1 day just to see Harry Potter (we toured US/IOS a couple years ago and stayed on-site, and we are not thrill riders but big HP fans).
My questions:
1) Do we need to add express pass to 1-day tickets if we go to HP first?
2) what time should we be at IOA?
3) debating car rental vs taxi pros & con
4) any other advice specially about WW of Harry Potter? (day of the week to go, things not to miss, etc)
Thanks!!!!
aj

The family is staying at WDW this mid-June (as soon as school ends). We want to take 1 day just to see Harry Potter (we toured US/IOS a couple years ago and stayed on-site, and we are not thrill riders but big HP fans).
My questions:
1) Do we need to add express pass to 1-day tickets if we go to HP first?
2) what time should we be at IOA?
3) debating car rental vs taxi pros & con
4) any other advice specially about WW of Harry Potter? (day of the week to go, things not to miss, etc)
Thanks!!!!
aj