End
Note that End completely stops code execution (within the current call stack so it doesn't effect other projects like Addins etc (a good thing)) but it will close any open file handles (a good thing). On the other hand, , static and module level variables (if you use them) will lose their values and Class terminate methods won't be run so if you have more of an 'app' than a macro this may not be desired.
It sounds like for your purposes this is ok and is probably the simplest way to go about it.
A silly example:
Sub foo()
Dim i As Long
For i = 0 To 10
If i = 2 Then
Debug.Print "hooray"
End
Else
Debug.Print "hip"
End If
Next i
End Sub