Laying wood planks down will provide a smoother rolling surface, but probably ruin your lawn. For those who are blind or have visual impairments, raised beds are closer for locating, touching, and smelling. Try planting herbs or flowers with a nice fragrance, such as basil and hyacinths. Also use plants distinguishable by texture, such as ferns and soft petal flowers. Hang up a wind chime to orient yourself to a specific part of your garden.
Wind chimes can also add a sense of peace and tranquility.
Try an inexpensive, store-bought rock garden with a fountain for the pleasant sound of gurgling water. It could be your meditative respite. Certain flowers attract birds or butterflies. A basic gardening book will recommend them. Birds also like a bit of water and food, of course.