Is it difficult to travel to Caribbean Bay from Myeongdong?

I checked that Uber ride is approximately 90 minutes from Myeongdong area to the water theme park Caribbean Bay. Given the travelling duration, I think I will get a Uber/taxi for this journey, so I'm worried about the availability of Uber/taxis.

1. Will Ubers or taxis accept this type of long ride?
2. Would it be hard to get an Uber or taxi for the return journey back to Myeongdong?

EDIT: Thanks for all the replies! I'm asking for taxis because I'm travelling as a family of four. On a tour agency website, the shuttle bus for 4 persons, totals to KRW 48k for a return trip. Which is roughly the estimated the single-direction fare on my Uber app. My worry is about taxi availability at Caribbean Bay.