Nicaragua’s currency is the cordoba. In most areas, USD (US dollars) are widely accepted, but using the local currency for low-priced items will save you money. If you would like to exchange your cash into cordobas, you can find the most recent conversion rate via Google.
For more details on exchanging currency and to learn about foreign transaction fees, check out this article.
Nicaragua has a tropical climate year-round. There are two distinctive seasons--the “dry season”, and the “rainy season”. The dry season lasts from December/January - May/June (depending on where in the country you are visiting). The weather is at its peak during the dry season, and is a great time to explore local beaches. The rainy season tends to be rather wet, and is the perfect time to explore Nicaragua’s luscious rainforests, as plants are fully in bloom.
Nicaragua has the same sockets and voltage as the United States, but many eco-friendly resorts often don't have a place for a grounding prong, so you may want to bring an adapter.
Always check the US Department of State website for full details regarding visa requirements.