I tried building the tracks for roller coaster and water splash, but it won't show up. Any advice?

Hmmm yesterday I built both. For the roller coaster I built the entry first. Afterwards I clicked the 'rides' button and next to the roller coaster there was a track icon. I clicked on the track icon and started building.

Slide appeared to be the opposite. I built the track first (same method) then placed the entry. People enter on the... left I think? Don't forget to 'open' the roller coaster otherwise people will walk past it + never use it and you'll get frustrated like I did.

My only issue is deleting rides now!!! HOW DO I DO IT?!?! :D

Right click on the ride's entrance should display a prompt, asking to confirm removal of it.

Thank you sir... works like a charm!