Getting from Girona Airport to Lloret de Mar can cost you a fortune, but it does not have to.
Their are many ways of getting to where you want to go, Train, Taxi and most cheaply by Bus.
The Train can be a little bit of a pain, a bit of a walk from the Airport and then maybe a mile or so depending on where your staying, so this might not be the cheapest option.
Taxi's are extremely good at getting where you want to go, but they are expensive. You can get one right outside the door of the airport, but it will cost you a fortune, also depending on your location. Don't be surprised if the fare is above 50 Euros or even 100 Euros.
Buses are still the best option, cheap, and most of them drop you nearly outside the door of large Hotels or CampSites. They are also directly located outside the door of the Airport, these are always the best option, as long as this fits your lifestyle. If you have young children, this can be fun for them but not so fun for you, especially if it's a late night flight.