It's extremely dark here too, which is why we have those solar lights around our circular driveway all year long. I was thinking that those cheap $5 lights you can get at HD or Lowes would probably fit into either conduit or 1/2" PVC to raise them off the ground and you could use an orange gel to change the light color too. Since the ground here is so hard, we never use those little plastic stakes that come with the lights, we just pound in rebar so it shouldn't be hard to insert a 2-3' piece of PVC over the rebar, insert the light into the PVC and it's very easily reversible.My sidewalk is pretty dark so we have some cheap solar path markers out year round. Last year I used some Halloween themed caution tape and ran it around each marker and strung between them to make a definite line along the path. I also put little pumpkins with battery operated tea lights along the way to further the spooky border. This year I'm adding a shepherds hook on each side holding a wooden LED lantern (painting them right now) that I bought at Michael's.