How do i make cruising more fun?

[Mr. NB]

Maybe change your interior regularily, so you don't get fed up with one car.

I'd try some cruising setups too, if you are driving at the speed limits, with a stiff racing setup, it could get quite boring.

Also, try changing the textures a bit, there's a lot of them available on the official LFS forum. It definetly makes the game more fresh, for a while at least.