Don't know how much a taxi is, however
There is a pirate cruise at CBR and also one at the GF - if your schedule works with the CBR one then voila transportation problem is solved - if you choose the GF one then it is an easy hop to MK and then a monorail ride over to the GF
Our DS#1 has gone on both the BC/YC (Albatross) and the GF Pirate Cruise and likes the GF one the most - with the 7 seas lagoon being large, he says it feels more like the real seas the pirates must have sailed
CBR cruise is on Tuesdays at 0930 hours
GF Pirate Adventure is Monday, Wednesday, Thursday, Friday at 0930 hours
Cheers
jaysue