Final answer:
The orchards and vineyard are remarkable for their beauty and abundance.
Step-by-step explanation:
The remarkable aspect of the orchards and the vineyard is their beauty and abundance. They are described as large, shady, and full of box-bordered paths, with long grape-covered arbors and seats under them. The orchards produce plumpest grapes and richest wine, while the vineyard yields plenteous crops of golden grain. The description emphasizes the marvel and magnificence of these gardens.