Our last (and only) trip to UO was December 19-26, 2008. On that trip we had the $99 week-long tickets. We stayed at the Doubletree at the entrance to Universal for the first five days, then did our last two days at the RPR.... And FELL IN

with both the hotel, the pool and the FOTL pass.
My initial plan for this trip was to do 4D/4N at RPR because the kids have been asking to go to the beach, so I thought that would make a nice split week trip (9 days total counting drive time from Indiana). Dh and I are not huge fans of the beach so it's been 9 years since we took a beach vacation. The kids love both, theme parks and water/beach.
So (here's where my internal debate starts):
Will we be dissapointed with only four park days? Will it feel short/rushed after our lengthy trip in 08? DH always needs a break from the sensory overload at theme parks and we enjoy spending the heat of the day at a pool, so we would
not be staying in the parks all day long. We have NEVER managed this at any theme park, ever.
OR
(On the flip side) Will a week be too long because we already know which attractions we would skip and we've already been there/done that?? The only new attractions are WWoHP and HRRR. We did every ride on our last trip (except DS who was too short for Hulk and DD).
We could fit in a full week at Universal and still have time for a beach day for the kids, maybe two if DH is willing to drive through the night again

.
I did the budget for both options and don't feel it is cost prohibitive to do a week at UO and cut back on the beach, but I simply cannot decide which option is best. (Why, oh why, does UO not offer a ticket option between 4 and 7 days. It would make this decision much easier.

)
What to do? What would you do?