Since entering the realm of nursing, I have started several habits, some good, some bad:
-going to "church" after work and having a breakfast of vanilla absolut + cranberry juice while talking with other co-workers about things OTHER than work...
-crocheting (and actually taught myself with one little 10-page book while on a travel assignment in California, now I make afghans!!)
-reading (ok, I did that prior to nursing -- if I really want to relax and not have to exercise my brain I check out "chick lit" from the library -- kind of like a series of sex and the city in the form of a book... mindless pleasure)
-hot baths + books or magazines
-gardening (so far my thumb is pretty brown, but has shades of green... wish I could get things to grow just by looking at them like my mom seems to do)
-smoking (eek, bad habit but it does relax me so I'm including it in my list of "relaxing" activities)
-Texas Hold'em poker tournaments (fun, social, definitely gets your mind off work)
-wine tasting (I live in central IL, my DH's parents live in St Joseph, MI -- I never knew how many vineyards they had just in that small stretch of highway in Michigan)
-nightcap of white zinfandel
-Law & Order (can watch that for hours... often while crocheting... LOL!)
-movies (we go on tuesday nights when you can bring your own bowl, any size, and get it filled with buttery goodness for $0.25)
-education (I am interested in alternative medicine -- have taken a couple reiki classes, went to a couple energy healing seminars, etc -- definitely relaxing)
-cards -- we play at home when we aren't out playing in a bar or at Vegas
-vacation -- I have learned that I am happier when I actually USE that stuff called "vacation time" and go somewhere, whether just up about an hour and a half to stay the weekend in Chicago and go to "The Taste" or actually fly and stay somewhere... either way, getting away is always relaxing
-cooking -- I love to cook, especially when it's not "hustle and put something together for dinner" type cooking! along with this, I watch FoodTV and that, to me, is relaxing... watching people cook, make everything difficult look SO easy.
What else? We go on dates, go shopping, get together with family... I go to the library, and I am teaching myself Haitian Creole with the goal of going on some medical mission trips to Haiti.
Your best bet is finding something you're interested in and diving in head first. I have always been into art and crafty stuff, but don't have the patience for sewing (quilts are so beautiful but such a PITA), which lead me to crocheting (I like to see results fairly quickly, and have an actual end-product that I can USE (or give away as a gift). I went on mission trips when I was younger, always wanted to return and donate my time as a nurse. I like white zin, although I don't drink very often, and when I do, not a whole lot. I love hot baths (I'm talking, run a bath half-way, then turn the water to scalding hot and let it run -- which I am positive is not very good for you), and I either read women's magazines, health magazines, gardening magazines, or fiction books while soaking the stress away.
Hope that helps! Those are my relaxation practices.

Good luck getting some R&R!!