I'm one week out of knee surgery for torn meniscus and it looks like my running days are over. I used to ride a lot when Dad first took off the training wheels, but that was over 40 years ago. I'm a complete newbie when it comes to what's out there now and I have no idea where to start. I'm 6'3", 190 lbs, with long legs (and bad knees). I welcome any and all suggestions... road bike, mountain bike, tricycle... ? Thanks.