I used to come here all the time as a child even though it was practically in my back yard, and we had a blast! My brother's and I would go on hikes and explore and we didn't miss our Game Boys one bit! This was a time before smartphones were a thing so I can't necessarily speak for kids today or whether not they would enjoy being off the grid or having temporary detachment of their feeds.
My brothers and I came back as a memorial for our mother since we had so many happy memories staying in the cabins. While the cabins have had some updates over the years it was still as rustically cozy as I remember, and nothing comes close to beating the views you have from your cabin. Since your primary source of heat is a wood burning stove I'm not sure I would recommend the cabins for very young children. However if your kids or anyone else in your family love hiking, camping, nature, or if you remembered to pack the Jiffy Pop and fixings for s'mores, it truly is a memorable experience for most ages. Steep Ravine is such a treasure to the Marin County coastline. **YOU NEED RESERVATIONS to get a cabin** So plan your trip accordingly. You definitely do not want to miss out on an opportunity to stay at Steep Ravine, it is worth it.