Feel free to buy tickets online in advance and make sure your camera/phone is charged and ready to go for all the beautiful photo ops!
The house and grounds are not stroller friendly. My advice would be to either bring a carrier or have little ones walk if they're able to.
Visit early in the day to beat the crowds and summer heat.
The gardens are open from the end of March until end of October, so make sure to visit in the spring or summer.
Kids under 7 are free!