Pop to Epcot -10 minutes, taxi stand is at bus stop area.
Pop to DHS - 5-10 minutes, taxi stand is also near the bus stop.
Pop to AK - 15 minutes, taxi stand is near the park entrance.
Pop to MK - 15-20 minutes, take taxi to guard kiosk at CR and then a 5-10 minute walk from there. If you don't tell driver to take you to CR you will be dropped near the TTC and will have to take the monorail or boat from there to MK.
Cost will vary with destination but probably won't be more than $20 plus tip to MK and AK, less for Epcot and DHS.