There is no good reason for anyone staying on Disney property to drive to the MK. You have to park at the TTC, possibly take the tram depending on how far out you park, and then take either the monorail or boat over to the MK. The Disney bus will leave you right at the entrance of the MK. You should be able to take a bus from the MK to Typhoon Lagoon. If not, you can go to any of the hotels in the area and take the bus from there. CR is a short walk or monorail ride from the MK. You can also catch a bus at the Poly or GF via a short monorail ride.