Being from Crosby (down the road from Formby) & having spent a lot of time in Formby I can confirm its a great place for a day visit, not sure about a whole weekend. Also I don’t really know of much camping in the area, we dont get much of that round our way!
Also your 45-60 mins from Liverpool Airport, North Wales, Cheshire etc are equally as close.
If its deffo Formby I’ll get ‘Adrec’ to tell you the best drinking & eating establishments.
Also formby is only a short train journey from SOuthport or Liverpool if you do base yourself there!
At least you have the weather!