Russ,
I think the idea of merging different themes is a terrific idea, and the outcome probably very good. We want to stimulate interest and personalize learning whenever we can. If we capture the students attention then we have them "hooked", and will be more able to cement key points or ideas central to the class topics. Field trips are especially good for motivation, and oftentimes students determine to focus on their studies a bit more seriously.
Barry Westling