Are you going to Flookburgh
If so I havnt done much around there but the estuary by Grange over sands can produce some good sport for Flounder, think its a high water mark as the sand at low water is treacherous with quicksand so local knowledge is necessary
Across the water from Grange over sands is Arnside which is a little further up the estuary but a very comfortable spot to fish from, go left from the carpark and and its a 5 minute walk to the old life boat house, fish anywhere along there with lug or Mackerel on the flood and over high, can be very muddy but if you stay on the bank you'll be fine
The docks at Barrow im told are worth a visit and is on my list of places to try
Silecroft is worth a visit for Bass and isn't far to go, fish by the toilet block in the carpark using fresh Lug fishing 2 hours either side of high water.
Further North you have the beach at Bootle which is a mix of rock and sand and is fished over low water and you can pump lug here too, Codling Bass and flattys can be caught here.
Further up again you have Drigg which is a surf beach and is popular among the Bass fishermen, fish over low on a big tide just left of the rocks known as Drigg scar, can also produce Codling Whiting Flounder Dab and Plaice and plenty of lug to pump here.
A bit further north but a good place to go with the family is Whitehaven as the mrs can go round the shops and you can fish off the beach behind Tesco at low, between the pier and the rocks on the right known as White rock or from either of the harbour piers over high, a very good mark for Plaice with some big Mullet in the harbour.
(Some good cafe's and chip shops here too)
Hope this helps good luck