If you are coming by car, you can either plot us into your GPS using the address Gartnervej 2, 4684 Holmegaard or you can take advantage of the route planner at Krak http://map.krak.dk/ruteplan/
To reach BonBon-Land by train, take the regional train that runs between Næstved and Roskilde. It stops at Holme Olstrup Station and from there it is only a 5-minute walk to BonBon-Land. Find the train at Rejseplanen http://www.rejseplanen.dk/
To take the bus to BonBon-Land, you need to take bus 630R that runs between Næstved and Fakse Ladeplads. You can find the bus timetable here.
The map here shows you how to get from Holme Olstrup St.