The Collaborative International Dictionary of English v.0.48:

Paradisiac \Par`a*dis"i*ac\, Paradisiacal \Par`a*di*si"a*cal\,
   a. [L. paradisiacus.]
   Of or pertaining to paradise; suitable to, or like, paradise;
   paradisaic. --C. Kingsley. --T. Burnet. "A paradisiacal
   scene." --Pope.
   [1913 Webster]

         The valley . . . is of quite paradisiac beauty. --G.
                                                  Eliot.
   [1913 Webster] Paradisial

WordNet (r) 3.0 (2006):

paradisiacal
    adj 1: relating to or befitting Paradise; "together in that
           paradisal place"; "paradisiacal innocence" [syn:
           paradisiacal, paradisiac, paradisaical,
           paradisaic, paradisal]