For the Creature ride, this is what I would suggest over the boat ride.
After the aftermath of Monsters Unchained, Gilllman has been set loss and it is up to our team of explorers and monster hunters to get him back. Riders think that this is going to be a boat ride, however during one of the preshows after we all end up on a large Amazon jungke cruise style boat, Gilllman aboards and attacks the ship captain, the engine and our lifeboats leaving us on a slowly "sinking" ship. Thankfully, he did not touch the submersibles (not controlled by a playstation controller) attached, which we board in hopes to find him. For this effect, for unique rides....there is a daytime version and a nighttime version. Daytime is mild and more family friendly whereas Nighttime is terrifying.
Guests aboard their submersible which holds 16 guests in front of large rounded sub windows located on the front, back, and sides (one side by side bench one each side holding 4 spots) allowing for different viewpoints and also another way to add rerideablity. The vehicle is inspired by Tokyo's Disney Seas 20,000 Leagues under the Sea in which they use the multiple panels in the windows as a way to simulate being underwater and a suspended track. The benefit to this is it allows for AAs and screens to exist and not get damaged as easily as the ones seen via River Adventure and Jungle Cruise. while maintaining the illusion we are underwater. The unique aspect as well is while we are inside an enclosed ride vehicle, there is also a motion base that provides shaking and more. You enter the sub through the side and you see a grated flooring above you leading to the control deck where our skipper is (similar to Kong but instead of it being a AA driver, everything about the grating flooring are screen elements) and next to the windows are gears, radio speakers, panels, trinkets and buttons that do nothing.
Through our journey, we see scientists and those searching for the creature outside the sub get attacked not only by Gillman but other water monsters before we see Gillman or "multiple Gillman" attack our subs. In the daytime edition, the lights are bright through the ship windows so you can see almost everything as it happens but night time, you only have the spotlight on the vehicle and a slight light from the moon to help you see in the darkness of the waters.
Daytime Edition: Following the first set of monster attacks, you feel the knocking and scrapping as Gillman enters your ride vehicle... water trickles down inside the vehicle from above and through the panels on the side getting you lightly wet but as you look up, you feel water lightly fall on you making you realize he is right above you on the grated floors above you. You can make out the shadows of his feet as he walks. Following that you hear a scuffle and some loud noises and then you realize there is scuttle going on above you. You hear the monster hunters on the sub with you stating everything is okay and that the Gillman have been maintained and you will head back to the exploration lab for a debrief.
Nighttime edition: After Gilman's attack, all power is lost on the sub with water trickling in from the side consoles not where the windows are located as he attacks, and you see a glowing green eyes above you looking down into the grates as you realize he maybe has managed to enter your sub from the top...you hear a scuffle in the darkness as a flashlight moves above you seen through the grating,, there is a fight and gun shots sounds and you feel warm water hit you from above. While all this is going on the sub is rocking in the darkness making you feel as if there is no control of the sub. There is a bit of silence before you hear more a scuffle, human screams and a roar by Gillman before the power in the sub comes back up. above you, you see water drops highlighted with red LEDs to simulate looking like blood. You see the limp body of Gillman above you on the grated floor as the skipper states you got him and are heading back to the exploration lab for a debrief. In this edition, while you are getting off the ride vehicle, you may notice Gillman starts to move and get up ready to attack our unsuspecting skipper.