I went on Halloween for OMSI After Dark
and thought it was great fun. We saw a lecture on psychopaths and the interactive exhibits were great. It's not the cheapest ticket ever, however you can literally spend the whole day and/or evening there.
So Much Fun!.
I haven't been to OMSI for many years more then I would like to admit. Fortunately I was able to go with my niece and nephew and we had a blast. It is the perfect mix of education and fun. The kids and I both loved it. Perfect day!