All three are fine. J'aimerais y aller and Je voudrais y aller? Refer to a place you have been talking about. "I would like to go that place we just mentioned" J'aimerais aller là bas. = I would like to go over there.

Hello! Twice are well but the best sentence is "Je voudrai y aller".You haven't put a final "s" because it's the futur.