BASH blank alias to 'cd'

I am a happy BASH user. I do not want to switch to another shell (in this case ZSH).

ZSH has this ability to change a directory without necessarily typing:

cd /to/a/directory

What would be the correct alias (or maybe BASH function) to change directories without having to type cd?

On my above example, moving to /to/a/directory would be done like this:

/to/a/directory

I have tried:

alias ''='cd '
alias ""='cd '
alias " "='cd '

Any ideas?