Helpful items for your packing list:

• clothes (including spring/autum jacket for cooler evenings, especially during months of May-August, when temperature can drop near zero degrees at night)
• comfortable shoes (including hiking shoes)
• sun glasses
• sun-screen lotion
• binoculars
• camera
• personal medicaments
• sun hat

For a self-drive/camping tour (besides mentioned above):

• good walking/hiking shoes
• small pillow
• torch or headlamp