Use rocks to separate the grass from the deck, then bury rope lights in the rocks for lighting..
Guided Gardens: Beautiful Wooden Pathways. This was a mangaris walkway sealed with penofin hardwood stain. The planks were custom made and each piece was tapered to achieve the curves. Fasteners were plugged for a blind fastened appearance.
Decking - Landscape Garden Design and Build London love the idea of a deck pathway, and the lights are gorgeous in it
Garden structure - Courtyard Garden with Limestone Paving and Hardwood Deck and Bench by Modular Garden