Great experience to understand HK landscape. I didn’t realise these (Geo structures) were lava formations ! The boat brought us to close proximity to the Geopark which was a plus as it’s impossible to hike. The guide and boat owners were English speaking and well organised. We were contacted a few days before the event by email and WhatsApp. The weather was fine although raincoats were available. Life jackets are provided. There are also 15-20 seats on the boat which double up as bag storage. Bring water, a small snack, Sun hats with string fasteners (under neck), sun lotion (my hands which were exposed were sunburnt!). Sit up close to the guide as it’s impossible to hear anything on the boat otherwise. These eco guides are strictly certified so choose them and not the operators who have little regard for the preservation of the Geopark.