The issue with what you suggest, at least from the Christian perspective, is that a surprise is basically impossible for God no matter what. I mean sure, you can argue that it is possible for God to create something that operates outside of his own rules. But he'll have always know that he will do so, and always know what comes after. The nature of God is one that goes beyond the boundaries and understanding of man. Simply put, when God feels something, it is a perfect feeling. Hence the concept of his perfect love, his perfect sacrifice, the perfect bliss he can provide. To feel perfect boredom, though. What would that entail?
We feel bored when we have nothing to do, and we seek out what interests us. What we are passionate about is the things that we love and hate. Seeing as God is ultimate love, he cannot be classified as hating, which leaves us with the aspect of love alone. What God feels is a perfect love for us. So in that regard, that we exist is the conclusion to his perfect boredom. Alternatively, you can consider a perfect boredom to be one that cannot be countered even by a perfect love. In which case, one would have to conclude that God is always bored, and this boredom cannot be satiated.
To return to the point, the main flaw in the reasoning given is that it assume as an experimental God. Yet the God described by Christianity is all-knowing, all-present, all-powerful. He is not creating things to satisfy himself. He is creating things simply out of love and passion. It's certainly a difficult thing to grasp, seeing as we as humans cannot feel such passion. After all, no matter how much you love something, biology and life events will always get in the way. You can be a man who loves writing more than anything, pouring out thousands of words of text. But you will eventually get hungry. You will feel arousal as your thoughts wander. You will feel thirst and begin to grow tired. Your body will ache, your muscles demand additional motion. Others will come to you and interact with you, with the alternative, complete separation from human contact, being even worse for your own mental state. It's no coincidence that a lot of people who were great artists, composers, and the like have reached an early end. When we model our creator and become creators, we pour out our finite life into our newly minted world. Within this universe, energy is conserved. So if we try to put it somewhere else, we must naturally take it from ourselves. I admit, I'm waxing a bit poetic here and taking some rather long strides in logic, but you have to admit that it at least sounds cool.
God cannot surprise himself. But what he can do is craft a world where surprises exist, and where others can enjoy them. The ultimate expression of love and sacrifice, the giving of something that one cannot have for himself to another.
Let's begin with a bit of psychology. Did you know that all humans lie? It's not just a phrase, but an aspect of mental development. When a child grows, there is a point in time where he begins to do so. If it is inevitable, then should we punish a child for lying? Of course. The punishment doesn't need to be harsh, of course, but you do need to do so. Otherwise they will continue to do so. Pain and ill feelings are required for a learning experience. It's the same reason a child born without the ability to feel pain will do things like breaking their own arm on complete accident. They simply do not understand.
Perhaps you should do research on what happens to humans born without a sense of touch or pain to understand just how very important these factors are to our well being. Without them, we cannot survive. Yet if we were to live in a world where everything was to be closeted off, we could not have fun. If you are terrified of breaking something, you can never go on an obstacle course, or go sky diving, or even go for a bit of reckless driving down the road. And at the greater, metaphysical level, the same applies to the necessity of punishment.
God is the root of everything. But he is not the direct cause. It is not his fault that we sin. It is our fault that we sin. The logic you suggest is essentially the same as saying that it's not your fault for shooting a man, it's the fault of the gun-store for selling you a fire arm. Rather than accepting personal responsibility, the idea is given that a higher power must be to blame. God gives man a way to salvation. Man may freely choose to accept or deny this. Essentially, the error of what you suggest is the concept of destiny. There is no such thing as destiny, because it implies that such things can be predicted. God knows what will happen because he knows all. But he has no preordained it. He has simply crafted a world that operates under certain laws, and given humanity the ability to alter its course. He has already seen where that path will end. But it is still one we made for ourselves.