would it be expensive to get a taxi from pudong international airport to The Sunisland international club?

Yes, it is. There is around 90km between PVG and the club and it takes around 1.5h by taxi. The fare will be high. Then I suggest you take airport shuttle buslin 7 to SH South Train Station, near which you can transfer to Shangzhu Bus Line to Zhujiajiao Bus Station. Then the international club is around 15km away, so you can take a taxi to get there!