Lake Asal and the relatively young volcano of Arboukoba offer stunnigly beautiful views. See the salt flats and the seismological probes. They are pretty close to Tadjoura as well as to Djibouti city so it is realtively easy to arrange a trip here.
2: Tropical Aquarium
Also worth seeing in Djibouti is the Tropical Aquarium with underwater exhibits from the Red Sea (open daily 1600 -1830), and the Presidential Palace.
3: Cheetah Refuge
Awesome travel spot for tourist and locals. This place is not the most luxorious but it's definitely what you make out of it and some.
4: Afar Triangle
Djibouti lies within a geological feature known as the Afar Triangle, one of the hottest and most desolate places on Earth. Part of the Great Rift Valley system, it is a wedge of flat desert pushing into the Ethiopian Massif. Much of it is below sea level
Situated at the point where the Red Sea flows into the Indian Ocean, the country of Dijbouti offers divers an incredibly diverse range of marine life.
6: Lac Abbe
Lac Abbe must rate among the most desolate places on earth. The scenery is unique: the plain is dotted with hundreds of limestone chimneys, some standing as high as 50m (165ft), belching out puffs of steam. These spikelike chimneys are the result of calcareous deposits across time. Though desolate, it is not uninhabited. Numerous mineral-rich hot springs feed the farms of local nomads who graze their camels and goats here. The banks of the lake are also where flamingos gather at dawn.
Tadjoura is Djibouti's oldest town, and as such it gave its name to the gulf separating the Afar and Issa lands. Originally a small Afar village trafficking in slaves, it's nestled in the shadow of the green Goda Mountains with the bright blue sea lapping at its doorstep. When viewed from the sea, Tadjoura's setting is especially spectacular. Within 10km (6mi) of town, there are several peaks that rise to more than 1300m (4260ft), and there are superb coral reefs accessible to snorkellers and divers close to shore.
8: Khor Ambado
Located a 45-minute drive by four-by-four from Djibouti town in Tadjoura Bay, this idyllic white sand beach is a wonderful snorkeling spot. Explore a reef teeming with sea life just 115 feet (35 meters) from the shore. Though a popular destination for European tourists and expatriates, Khor Ambado is rarely busy.
9: Djibouti Town
Explore the capital city, both the traditional side (inhabited by Djiboutians) and the expatriate neighborhoods, complete with Western restaurants. Wander in the market, and observe the sale and consumption of the popular drug called khat, made of leaves of a plant native to East Africa that are chewed to give the user a sense of euphoria.
10: Moucha and Maskali Islands
These islands are about a 45-minute boat ride from the port of Djibouti town. The waters off these islands are a dream for divers: manta rays and various types of sharks live around the islands.