Hi Kieth
Without coding - I don't think it is possible. Coding is a bit daunting initially but if you give it a try it will usually prove worhwhile in the long term.
If your option group has Yes or No, then probably the value is either 1 or 2.
Select your option group in Design View. Click on Properties (right button on mouse) and on the Tabs for Properties select Event. From this shorter list of Properties select After Update and choose Code Builder.
Your coding should then be as follows
Private Sub IXT_AfterUpdate()
If IXT = 2 Then
Me![Hotel Details].Visible = False
Else
Me![Hotel Details].Visible = True
End If
Me.Refresh
End Sub
Another bit of advice, Kieth. You ought to consider following the L&R naming convention for all your objects - see any decent book on Access for the suggested tags etc (usually postings on this kind of advice forum follow such conventions - believe me it makes life easier in the long run).
HTH
Rich