Do we have to pay to get in? If so, how much does it cost?

I recommend the annual pass as well. There are several events through out the year to make it worthwhile.

Yes. Check online, but I think it was $6.00

Yes. I think we paid $26 for three adults and two children.

https://southcoastbotanicgarden.org/hours-admission/

Not sure. I think the anual pass is the best option.