If you catch yourself traveling the "tourist route" from Cape Town to Simon's Town, then you may like to climb off at Kalk Bay to spend an hour or three visiting restaurants like The Brass Bell and Cape to Cuba; or perhaps spend some time browsing the small shops that line the main road, and then wander over to Kalk Bay harbour to see the fishing boats and watch the sea-hardened fishermen offload their catch.
Kalk Bay's a great place to visit and comes highly recommended - even if you decide rather to visit by car (and perhaps stop there for breakfast before heading on to Cape Point).
The blue light that you see at the end of the tunnel isn't the result of artistic photo-manipulation, it's rays of sunlight being filtered through the weather-proof structure that leads from the platform to the stairway. It does look kinda awesome in a photo, now doesn't it? :)