A beach vacation is a lot less than our normal Disney trip. Disney we do 8 or 9 nights at a moderate resort, package ends up around $3800 not including dining (going from memory, we haven't been for two years). We budget about $150-$200 a day for meals, depending on if we have a TS that day which we do 2-3 per trip. We don't do many souvenirs, maybe $100 total for that kind of thing (kids bring their own spending money). We drive from Ohio, it takes 14-15 hours and about three tanks of gas each way. We drive straight through on the way down and almost always on the way home, no travel hotel costs. I would guess we would spend around $5500 on Disney.
We have gone to the Outer Banks the last two summers, and several times before that. We rent a 4-bedroom house, (not a new, huge house), for the week, and I think we had about $1600 in total for the house this summer. We cook most of our meals at the house, and we spend about $250 on groceries for the week, the same as at home. We eat out one breakfast (probably $40 or so), one lunch (again $40-50) and one dinner ($125 or so) through the week. We drive to the beach, about two tanks of gas each way, no overnight stops. We don't buy souviners or anything, maybe an ice cream or snack here and there. We spend most of our time on the beach or at the house, we don't do mini golf, go karts, or anything like that. I think we ended up spending about $2400 total this year on that trip.