My wife and I have no children either, she does have a son from her first marriage, but she has not heard from him in at least 5 years. We have decided to leave everything to the local SPCA, since we are both lifetime dog lovers.
We're doing something similar.
I have 2 kids, but neither has any interest in any of my cars/"stuff". So as a stipulation of the will, all of my hobby belongings (cars, parts, tools) need to be liquidated (no dumpsters) to local car clubs, rebuilders, etc.- all named and with contact info) before they can get their hands on any of the property inheritance. Proceeds from the automotive end goes to two local animal rescues.