Thanks for your feedback. I'm planning on focusing on mindfulness and concentration, as well as the relationship between the two. I think I'll be able to address how those two are related to relaxation benefits.

Sorry but I don't really have a good answer to your question. I haven't explored many other practices with this aim. Sometimes I find that trying to put all one's attention into simple repetitive tasks where one isn't personally invested (like doing dishes) is relaxing, and can help maintain concentration during the day. This can be a form of meditation somewhat akin to walking meditation. The benefit I get from this might be dependent on my daily sitting meditation practice though.