Games like Vacation Adventures: Park Ranger 9
Games like Vacation Adventures: Park Ranger 9 include The Room, Morphopolis, The Room Two, Machinarium, and There Is No Game: Wrong Dimension. We matched them by the tags players give Vacation Adventures: Park Ranger 9 on Steam (Adventure, Casual, Point & Click, Puzzle, and Hidden Object): closest matches first, and among equally close ones the better-known games.

The Room
Shared: Puzzle · Point & Click · Adventure

Morphopolis
Shared: Puzzle · Point & Click · Casual

The Room Two
Shared: Puzzle · Point & Click · Adventure

Machinarium
Shared: Point & Click · Puzzle · Adventure

There Is No Game: Wrong Dimension
Shared: Adventure · Point & Click · Puzzle

Gorogoa
Shared: Puzzle · Casual · Point & Click

Hidden Folks
Shared: Casual · Hidden Object · Puzzle

The Room Three
Shared: Adventure · Puzzle · Point & Click

The House of Da Vinci
Shared: Puzzle · Hidden Object · Point & Click

Enigmatis: The Ghosts of Maple Creek
Shared: Adventure · Point & Click · Casual

GRIS
Shared: Adventure · Atmospheric · Indie

Rusty Lake Paradise
Shared: Point & Click · Adventure · Puzzle

Chants of Sennaar
Shared: Adventure · Puzzle · Point & Click

Syberia
Shared: Adventure · Point & Click · Puzzle

Boxes: Lost Fragments
Shared: Adventure · Puzzle · Point & Click

Enigmatis 2: The Mists of Ravenwood
Shared: Adventure · Casual · Hidden Object

Old Man's Journey
Shared: Adventure · Casual · Puzzle

The Room 4: Old Sins
Shared: Adventure · Puzzle · Point & Click

Grim Legends: The Forsaken Bride
Shared: Casual · Point & Click · Adventure

Lil' Guardsman
Shared: Adventure · Casual · Point & Click

Enigmatis 3: The Shadow of Karkhala
Shared: Casual · Adventure · Hidden Object

Fran Bow
Shared: Point & Click · Adventure · Puzzle

Abyss: The Wraiths of Eden
Shared: Casual · Adventure · Hidden Object

Iris.Fall
Shared: Adventure · Casual · Puzzle