It's not bad for you to ride two days in a row (or more), but just don't do a lot of high-intensity days back to back (or in a row). Low intensity recovery rides are very helpful, and from what I've read (and experienced), slow recovery rides are much better for you (well, at least for me) than not riding.

Now, regarding the other cross-training and how to fit that all in, you'll have to wait for another reply because I don't do any other (walking, weight lifting, etc.) exercise.

Rick / OCRR