My friend and I will be backpacking Nicaragua for about week in mid-October. We are backpacking our way to Costa Rica. We do not plan to rent a car, and instead will be relying on public transportation. Starting in Managua, what are some places we should definitely hit? What's important to us: snorkeling, hiking, wildlife, cultural experiences, off-the-beaten-path type spots. This is our personal adventure, and we are not looking to book tour guides! Any advice/recommendations about hostels and buses/taxi is appreciated as well! Thanks!