I don’t run with my cane, I do sprint interval training on a treadmill.

I use a beeper at each end between two posts about 50 metres apart. I follow the noise. I found that a lot easier than trying to negotiate a path. I also prefer running on the grass.

You don't.

If you want to run you need a running partner. Tie a string on one of your wrists and tie the other end of the string on one of your partner's wrist so you can run together.

I say cycling rather some kind of martial art would be good! Even rowing might work out well, if you know how to swim. I cycled tandem for about 4000 km a couple years ago and I currently do Brazilian Jiu Jitsu. But I’d think anything that gets you moving and jacks your heart rate up a bit should be good. Even yoga has things in that vein. There are also possibly other fitness programs, I’m not a personal trainer and I only have blindness to worry about, no other injuries. But finding something to fit your situation should be possible. I think the key thing is movement and something to make the heart healthy and the rest will follow.

Check out the local high schools and colleges in your area. A track may be what you are looking for, low impact, low traffic, and a surface change if you are in danger. No cane needed. I would look into clothing which identifies you as a visually impaired runner if you are going without your cane in order to avoid rude comments. Guiding eyes for the blind recently started certifying some of their guide dogs to run, so there is that. Finding a sighted guide is always good too, especially if you want to race one day. This is an area I'm quite passionate about. Fitness can and should still be a very important part of for life.