I think the other issue to consider is your in-laws. I'm not sure how frequently you see them, but I can imagine some hurt feelings if you went out on your own for a ride. I'm not saying such a reaction is altogether fair, but if you're both going "home" for a visit, they arguably want to spend time with both their son and you. It's an area where I'd tread lightly. Still, I think it's fine to go a for a short walk or run, especially if you can fit it in early or late in the day.
Obviously, I know nothing about your relationship with your in-laws. I'm mostly looking at it from my own vantage point as a DIL. Like you, I look for ways to spend some alone time without the in-laws during our visits to my husband's home, but sometimes I have to temper that desire for the good of the order.
All that aside, I agree that it sounds like a lot of hassle for just a three-day trip.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher