Nicaragua was rated the safest country in Central America, however, minor gang violence has been filtering into Nicaragua from Honduras and El Salvador. The capital, Managua, has the largest number of inhabitants but the majority of crime there is petty theft. Granada, the second largest city, is generally safe but using common sense and always walking with someone else at night here and everywhere else in the country is recommended.
In Granada, the moneychangers are licensed and provide a terrific alternative to the banks.
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Social workers in Granada strongly advise to not give money or food to begging children. In Granada the homeless situation is not nearly as severe as in other poor cities. Orphanages and charity organizations take care of homeless children, and poor people have access to charity kitchens. The kids that beg and sell items to tourists do this to make easy money, and are being exploited by adults. Anything you give to these children keeps them from the place they belong: in school. (http://www.caritafeliz.org), (http://www.la-esperanza-g...), (http://www.mifamilia.gob.ni)
Power outages can be frequent, especially during the dry tourist season. Electricity, water and internet can go out at any time and it is advised that you shower early to avoid the unexpected water shutdown. Occasionally inclement weather will create an outage, as you'd expect anywhere.
Some will advise not to drink the tap water as it will make you sick, though most have no problems. Also, make sure when you buy bottled water that the top has not been opened because some people without scruples will fill the bottles with tap water.
You must also be careful with the insects-be sure to bring repellent as Nicaragua does have malaria. This is especially a concern during the wet season.
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Internet -- up to 20 cord./hour.