A taxi shouldn't cost very much. San Miguel de Abona (where Golf del Sur is located) is between the airport and Playa de Las Am�ricas. The airport website gives the estimated fare to Playa de Las Am�ricas as �20.45, so the fare to fare to Golf del Sur shouldn't be much more than a tenner:
http://www.aena.es/csee/Satellite?cid=10481468 21249&pagename=subHome&Language=EN_GB&SMO=1&Si teName=TFS&p=1048146820964&c=Page&MO=1
This site seems to estimate the fare rather higher than the official airport website does (at around �20) but the use of 'we' in your post suggests that you'll be sharing a taxi so it still seems very reasonable (and a lot cheaper than booking the Resort Hoppa):
http://www.2bookaholiday.com/cheap_flights/Eur ope/Spain_-_Canary_Islands/cheap_flights_Golf_ Del_Sur.php?wai=1396885594&exr=inx&continent=E urope&cont_num=5&country=Spain_-_Canary_Island s
Chris