E.M.
we are going to lake cumberland for 4 days and its costing us 506 dollars thats for a 1 br cottage. but if you go to the ky parks website you can see all the places that have resorts we did alot of research before picking cumberland. it looks like its gonna be a blast when you go to the site you can see what each park offers where you can stay where to eat. most places have a lodge where you can ea tbut we did the cabin b/c it was cheaper to take our own food. http://parks.ky.gov/ then click resorts then just start clicking on the trees to learn about each park. there are parks where caves are the main thing, forest the other and of course lakes.
another thing we looked up was kings island if you go to their web page you can click on like where to stay and you can get discounts on admission and stay close to the park we found a hotel with a 2 day pass 2 night stay for 230 dollars.
one last idea (i started off with one lol) cinci is a pretty fun place too there are some museums Newport aquarium and the zoo and botanical garden. good luck!