And the OTHER reason to get tenure is to go on sabbatical, as Hubbers is doing now. Sabbatical simply means that he's freed from on-campus duties (like teaching) so that he can focus on research. He's writing a book on archeological myths and mysteries (check Amazon for his previous book).
Often, researchers travel during their sabbatical. However, writing a book can be done from home, although there is a danger in staying home during sabbatical:
Hubbers xeriscaping the yard today (also note the split-rail fence he built in January at the start of his sabbatical)