Possible Clues:

• He's self-centred in cloak
• Seek's opposite
• Tanning need
• Awful die-hard, to start with, having a thick skin
• He admits I would hear this at the surprise party
• Stay in the closet, say
• Camouflaged shelter offered by animal's skin
• Be intentionally hard to find
• "Where Do I ___," timid Nickelback song?
• What to do just before the surprise party starts