Ballooning is offered by Serendipity Adventures (tel. 506/2558-1000, U.S. tel. 800/635-2325, www.serendipityadventures.com [1]).
Helitours by AeroDiva (tel. 506/2296-7241, www.aerodiva.com [2]) offers helicopter tours, as does Montana Tours (tel. 506/8876-6902, www.montanatourscr.com [3]), at Arenal.
And Ultralight S.A. (tel. 506/2222-2246, www.ultralighttour.com [4]) offers auto-gyro and other ultralight flights at Flying Crocodile Lodge, in Playa Sámara, [5] at Bahía (near Uvita [6]), and at Timarai, near Parrita [7].
Links:
[1] http://www.serendipityadventures.com
[2] http://www.aerodiva.com
[3] http://www.montanatourscr.com
[4] http://www.ultralighttour.com
[5] http://www.moon.com/destinations/costa-rica/the-nicoya-peninsula/playa-samara-carrillo/playa-samara
[6] http://www.moon.com/destinations/costa-rica/central-pacific/costa-ballena/uvita
[7] http://www.moon.com/destinations/costa-rica/central-pacific/jaco/parrita