How busy will it be on:
The opening weekend (Sunday 22th March)?
Weekday after the opening weekend - Monday 23th?
First week after schools reopen after Easter holidays - 13th April onwards, Wednesday 15th April perhaps?
I'd like to have maximum wait of 10 minutes on all rides excluding the smiler? Is this even possible?
Opening weekend? Thats realy optimistic for such short queues. Not a chance, bro. Not 100% about the weekday, probably will be less busy but still more so than usual. Out of that list i would say the 15th of April is probably is most likely to have short queues-most of the people going over the easter holidays will have gone over the easter holidays. I think that the times you are proposing are possible but unlikely...maybe on an off peak rainy day you would get that
GMonster- fair choice, I cant see queues being too bad then. I sure hope it goes well!