Mamaia is Romania's premier Black Sea resort, a narrow strip of land running 7 km between a magnificent sandy beach and Lake Siutghiol, just north of Constanta. The sand is fine and the beach is wide — one of the best on the Romanian coast, and far cheaper than anything equivalent in the Mediterranean.
The resort was purpose-built during the Communist era and caters well to families. From May to September you can try snorkelling, scuba diving, parasailing, and windsurfing directly from the beach. A cable car (telegondola) runs the length of the resort above the promenade, giving aerial views of the beach and lake — a good way to get the measure of the place when you first arrive.
By night, Mamaia transforms into Romania's most energetic party resort. The northern end of the promenade has a cluster of clubs that draw DJs from across Europe in July and August. If the nightlife is not your thing, the lakeside restaurants offer a quieter evening with fresh Black Sea fish and Romanian wine.
Mamaia also makes a good base for day trips to the ancient Greek city of Histria (50 km north), the traditional villages of the Dobrogea region, and the Danube Delta further north.