My friend and I were up for a bit of sun, sea and s...kayaking, and I can say we had a great day. For people who love a bit of adventure, getting to the beach was a 2 minibus journey from Mongkok, first to Sai Kung McDonald's (hearty breakfast), then another to Sai Wan Pavillion (where am I?) From there, it's a 30 minute walk/trek to Sai Wan Village (village might be an overstatement :o)). Once there, you'll meet up with your guides.
In the village itself, there are publich outlets and some small shops to buy drink and even simple snacks. Also, from here, you can book the speedboat back to Sai Kung. This is hugely recommended as a) it's quicker than the trek and bus back, plus b) for thrill seekers it'll leave you checking your coccyx for breaks. Just akes sure you have a couple of hundred dollars each.
The day itself was hugely fun. The guides were very friendly and knowledgeable about what you sea on the sea, along the shore and in the caves. After half an hour changing clothes and reviewing safety and equipment if was off to the kayaks. To b honest, some element of fitness is required as you will have to help carry the kayaks into and out of the water a few times in the day, plus the actual day itself involves a lot of paddling, so lots of upper body exercise is done. The guide is however extremely patient and will set off at a pace suitable for all, and will even go in the double kayak with you if you are v weak. For the full day, a basic lunch is provided, but it was filling and nourishing all the same.
At the end of our day, we still had an hour to kill so off we went into the hills to find a hidden pool (ok, not so hidden), where you could go have a swim.
Word of warning, unless you want to resemble a rhino, bring your sun cream and use it everywhere including your hands!!