Need some help...please!

Hi,
I've started building a huge park on RCT3. Around the edges of the park by the entrance i made some mountains which touched the sides of the main entrance. I then decided i didn't want them anymore so i flattened the ground again. when i tried to reconnect the path to the entrance it won't completely connect. i opened the park and guests now cant get in!! i have tried everything to get them in. plus the ground is completely flat. What can i do? ? I really dont want to give up on the park as i've spent alot of time working on it....gutted!
Please help!