How far to travel with only 2 weeks vacation time/year

Like John S above, we often leave at dusk and do 200 miles. Last summer on the next day we changed destination to the Tetons because I-35 was closed north of us. Had not planned on doing 1900 miles in 48 hours but one of the best ways to see the plains is at night and we were in Jackson Hole the next afternoon.
PS, we are 70 and there is very little in the middle of th country we need to see again. For us it's still the destination... The West.