Cox's Bazar sits on flat coastal plain, so true mountain hikes do not exist within city limits. The best trails are in Himchari National Park 18 km south, the Teknaf Wildlife Sanctuary 80 km south, and the Ramu hills 15 km inland. Expect tropical forest, not alpine views. Most trails are poorly marked; hire a local guide through your hotel or risk getting properly lost. The terrain is steep clay, which becomes treacherous mud during and after monsoon. Dry season (November-March) is the only sensible hiking window.
Wildlife includes macaques, wild boar, monitor lizards, and over 200 bird species. Elephants occasionally pass through Teknaf. Bring serious mosquito repellent, two liters of water per person, and do not attempt any trail after 3 PM because the forest goes dark fast and there is zero infrastructure.
Number one is the Himchari Waterfall Trail, a 5 km loop through dipterocarp forest to a modest cascade. Takes two hours, moderate incline, stunning views over the bay from the ridge. Entry is $2 at the park gate. Two is the Teknaf Eco Trail, 8 km one-way through primary forest. You need a permit from the forest office and a mandatory guide ($15). Three is the Ramu Buddhist Temple Circuit, a cultural hike linking six hilltop monasteries over 10 km. Start at Boro Bazar and finish at Lam Bagan. Four is the Dulahazara Safari Park perimeter trail, 6 km of flat walking but you see sambar deer and peacocks.
Five is the Maheshkhali Island Hill Trail, a scrambly 4 km up to Adinath Temple. Ferry required, starts from Gorokghata. Six is the Chakaria Coastal Loop, 12 km along mangrove boardwalks and sand dunes. Birdwatching is excellent but the walking is dull. Seven is the Inani Ridge Walk, unofficial trail along the cliffs south of Inani Beach. No facilities, bring everything. Eight is the Sonadia Island Beach Trek, 15 km of beach walking at low tide. Only interesting if you are already committed to visiting the island; otherwise it is just hot sand.
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