Hi Lee,
Welcome!! I am the newest THR on the board

. I had simultaneous bilateral THR 6 weeks ago. So I can not speak to you from experience on how much I will be doing in the coming months. What I can tell you is what my OS has told me.
Now I am extremely biased that I have the most wonderful, skilled, marvelous surgeon in the entire world,

so make sure you talk about all this with the surgeon that is scheduled to do your surgery.
I have been told I will be able to ride horseback, downhill and crosscountry ski, run some, bike, roller blade, weight train, and lots of other stuff. Plenty of these activities carry a fair amount of risk, but no more than before surgery. You accept the risk. True you may injure your hip, but you may injure lots of other parts if you fall. If you love biking, you will still love it with your new hip. Even more. I do not think there is any weakening of the femur from THP, at least that has never been mentioned to me.