Entry and exit to/from Nicaragua are very easy, but keep the following in mind as requirements:
Passport must be valid 6 months beyond your intended stay in Nicaragua.
Ticket for return or onward travel.
Tourist card (US$10.00) when arriving in Nicaragua (must be paid in U.S. dollars), valid for 90 days in Nicaragua.
A valid entry stamp is required to exit Nicaragua.
Airport Departure fees are included in the price of your ticket.