Dangers & Annoyances
Mosquitoes and biting flies are a nuisance in summer, though they pose no danger to human health. Mosquito repellent is widely available in pharmacies, and most hotels and pensions have window screens. If you're planning a day out in the delta, wear long pants and bring a long-sleeved shirt to wear in the evening.
Be sure to bring a hat and sunscreen if you're planning on spending any time out on a boat. The summer sun is relentless and just a brief exposure can result in a nasty burn.
Entry & Exit Formalities
All visitors to the protected areas of the delta, including those on private hiking or boating excursions from Tulcea, Sulina or Sfântu Gheorghe (but not on the large public ferries), are required to purchase an entry permit. Permits are available for one day (5 lei), one week (15 lei) or one year (30 lei) from Danube Delta Biosphere Reserve Authority offices in Tulcea or Sfântu Gheorghe. Boats are subject to spot inspections and if you're caught without a permit you could be fined. Note you need separate permits to fish or hunt.