There is a parking lot right in front of the main airport. Have police there all night. Do not know the price, but I would guess 5 bucks a day…maybe less.
I left my car there some time ago and was ok.
Are you renting the car? If so, most likely better to return the car and then pick up another when you come back from CI
Sean's advice if renting a car is spot-on. In addition to the official airport parking lot, you might be able to arrange parking at a more reasonable rate (even though it's not pricey at the airport parking compared to most North American or European airports) across the street at the Best Western.
Otherwise, if you have a hotel in Managua, they should be able to provide secure parking and arrange for your transport to the airport for your flight to Corn Island.
Cheers, Mike @ Farmstay El Porton Verde, Managua
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