Exploring art and nature, the kinds that lift our mind to God, is a good hobby. Find interesting things to look at with a powerful magnifying glass or microscope. Learn to play or even build musical instruments. Try taking on the challenge of composing a strategy/formula for converting people to the true faith. I figure the best way is to guide them along a thought process by providing the information and questions to ask themself, but have them make all the conclusions, so they actually do some thinking.