A lot depends on budget, and what the OP intends to do in 2 days. Hire car?

€€€€€ ... The Longueville Manor. http://www.longuevillemanor.com/welcome
Fantastic hotel, but in a very strange location!

€€€€€ ... The Atlantic. http://www.theatlantichotel.com/ Modern-ish. Long way from Town [sorry, St Helier].

€€€€ ... Chateua La Chaire. http://www.chateau-la-chaire.co.uk/ We always stayed there on holiday when we started visiting JER. However, car essential as it's a long way out.