Route 17 runs parallel to the east of U.S. 27 (note: Route 17 just south of Frostproof, FL has the name the “S. Scenic Highway” and north of Frostproof it becomes the “N. Scenic Highway” for a while). Start this route in Sebring, FL and just take Route 17 north all the way until you make it up to the route’s end point in Loughman, FL (just about a mile south of I-4).
From there you can go or you can swing east to Kissimmee, or go west on Hwy 532 (north of Loughman) and get on I-4.