I read an article yesterday saying that in the current economic client many parents were concerned that they could not afford to take their children on days out over the school holidays. In London, for example, an entrance ticket to an commercial museum like the London Dungeon for example costs about $20 per adult and $13 per child. Train ticket from 1 hour outside at off-peak rates is about $35 for an adult and $20 per child.
The parents commenting in the comments section under the article were all fretting about what they would do.
There is clearly a need and an opportunity here which a person with good writing skills and a creative brain and some experience of what children might enjoy, could think up. It puzzles me, but does not surprise me, that parents are so lacking in thought power that they cannot think up some ways of entertaining their own children but clearly (from the hundreds of comments) many of them struggle to do this and up to now have solely relied on some overpriced "entertainment" presented to them on a plate. Well, now that entertainment and the gasoline to get to it is becoming unaffordable to more of them.
Paper chases, identifying local wildlife, species of trees, picnics, games in the park such as frisbee, a local children's "Olympics", a science club, a treasure hunt game (you'd lay the framework out on the blog as to how to organise the treasure hunt).
Do this with some skill and, through Facebook, you'd find parents promoting it to one another and feeding you new ideas and feedback. Once you have a few thousand website hits per day you sell advertising directly to people who want to get to the mothers and fathers who are accessing your blog.
I know a homeschooling mother of 11 children (not a Trad) here in the UK who runs her own blog simply focusing on the ups and downs of having lots of children and she makes about $34,000 per year after taxes. Not a bad little income for a full time mum.
A lot of this advice is out there already but not conveniently in one place. You organise it, use good judgement about what gives parents with little creativity and drive the best bang for the buck or benefit out for effort put in and re-present it to them in a more easy to digest format.
Perfect for a person who does not have a mush mind and a very moral little business helping parents to parent.