Working hard or hardly working?

So I was cleared to go back to the gym 2-3 weeks ago now, and since have been going to the gym 3-4 times a week. A good friend of mine who is really into fitness has been helping me. We have stayed away from "core" oriented stuff- we begin and end with 10 minutes walking on the treadmill, and every day do a different body group. Arms, legs, chest. We do calisthenics, we do weight lifting, very little cardio. This is because I was under the impression that I shouldn't do that stuff, just work on regaining and building muscle. But now I am worried thats not helping with my weight loss. Should I up my cardio???

Cardio and weight training are both important for overall health - you should be doing both of them as well as activities that improve your flexibility and balance.  

Exercise, in general, is a very small portion of weight loss - it's all about proper diet.  But it's VERY important for your health.  

honestly it is all good.  cardio, strength, yoga, sport -- anything. 

Over the past few years I have morphed with my exercise a few times.  For a while I was all about running.  For a while I was all about yoga.  For a while I was all about crossfit.  I tend to overlap, but as something new catches my interest I do it.  If something starts to get boring, I look for something else interesting.  

The key is do something you like because then you will do it! 

In terms of what you can do post surgery, I was cleared for cardio well before I was cleared for weights.  So if you are cleared to lift, I'd say cardio is probably fine, but it doesn't hurt to check with your doctor.