The Kowloon Peak Viewing Deck is located alongside Fei Ngo Shan Road (Wilson Trail Stage 4) around half way through the Ma On Chan Country Park. Here you find a large opening in the mountains and spectacular views of Kowloon, Victoria Harbour and Hong Kong Island in the distance. The walk up to the Kowloon Peak can be entirely by way of road from the south, making it very much accessible for any level of hiking experience.
Just to the south you will also find Kowloon Peak and the famous Suicide Cliff. This requires some more challenging hiking either from the east by way of Fei Ngo Shan Road or if you are an experienced hiker with good shoes, gloves and decent skill, an approach from the south near the start of Fei Ngo Sha Road and scrambling up the cliff side, first to Suicide Cliff and then further upward to Kowloon Peak (602m).
There are world class views of the Kowloon Peninsula from the Kowloon Peak area. Just below the TV and Radio transmission stations, you will find some flat area and quite a few spots to take a seat upon rocks overlook much of the city of Hong Kong down below you. Views are excellent when sky conditions are favourable.
Many locals enjoy doing the Kowloon Peak Viewing Deck and/or Kowloon Peak in the evenings allowing them to catch sunset and view the city lights down below. Early morning hikes before the sun is too harsh can provide rewarding views and a good bit of exercise as well.
Note: When it comes to hiking in Hong Kong, make sure to have proper shoes, hat, sunscreen, plenty of water and snacks and know the weather situation on the day of your hike. Make use of hiking trail apps like Hiking Trail HK and check in with forum posters on the TripAdvisor Hong Kong forum for help if you're unsure about anything before starting out on your own somewhere.