A new amphitheatre, viewing deck and a "visitor pod" will be built at the Twelve Apostles as part of a $154 million federal government splurge in Geelong and along the Great Ocean Road.

Prime Minister Scott Morrison will visit the region on Monday to announce what has been described as a "game changer".

State Opposition Leader Matthew Guy will not be with Mr Morrison when he announces the investment package on the Great Ocean Road. Instead, Mr Guy is travelling with reporters to Ballarat.

Mr Morrison was also absent from the Liberals' campaign launch in Ivanhoe on Sunday, despite his appearance in western Victoria less than 24 hours later.