Pliny obviously loved the countryside, and solitude when there. He gives us and extensive, lovingly descriptions of his villas at Laurentum and in Tuscany, and how he contrived to make use of space for himself removed from all noise and interruptions. The villa at Laurentum is certainly to die for! This article* has a drawing of the layout of the villa. I also like Pliny's description of nature and natural phenomena.
IV.30 the spring at Lake Como
VIII.8 the source of the Clitumnus
VIII.20 Lake Vadimon
* a review of Caroline Lawrence' Roman Mysteries is coming soon.