A Dive Coaster is the perfect roller coaster in an amusement park/theme park
Here you can see a simple B&M Dive Coaster which should not be missing in every big or small theme park.
Instructions:

Here's a screenshot from above.

The waiting area got a jungle theming from me.

The B&M Dive Coaster at night.
Doesn't look bad 😀
quite okay. you can make it a bit more realistic by adding a small "auxiliary staircase" to the fahrban, especially on the ascent.
Agree with @0815julian there. So a more realistic entrance area would improve it a bit. I like the idea and the rest of the implementation though. I'd still be interested to know if you had a specific park in mind when you built it?
Not to a certain park but to a roller coaster "Krake" from the Heide Park and with such a big lake a dive coaster was the best choice, that's why my coaster has a splash down after the first drop like "Krake".