We always go to Elveden just because it's easiest to get to for us. I would pay to be central, aim to get there for 10, gives you a whole extra day, do a big shop before you go, food there pretty rubbish, book yourself into the spa on the first night less busy (if your partner doesn't mind dealing with the kids...you want to get your relaxation in early, moonlight spa cheaper 6-9). On the last day go swimming, don't rush to leave. Some of the cheapest villas are the most central, they are fine, better to spend money to be central than on upgrading. Book an activity a day but don't overfill your time, you will want to swim most days - time out clubs are good if you want a rest from the kids. (And we always do midweek for the extra day)....