Personally i think that valentines is just a weeze for shops/restaurants etc to make yet more money and as such we don't bother at all.
But I do think that for those that do bother, it's about love and romance and red roses and chocolate and nice meals out etc, and I actually find it quite inappropriate that young children are taught about all that, that parents make cards for their children on valentines so they don't have to go without etc.
valentines is about romantic love, and imo is not for small children.