Can I purchase all tickets early n go in a bit later?? Family cant all meet at the same time until noon time. I want to make sure we get tickets for all n not get turned away.

Yes. It closes early so try to be there at least by 12 noon to enjoy all the exibits

Yes. Actually they recommend purchasing tickets online. The entry window is an hour i.e. 9 to 10

Yes, we arrived late with kids and no problem at all

They accept walk in now. You dont need to pre purchase tickets to even entry.

Usually they are fine with letting you in earlier than your bought time.