Flint Castle is about 30 mins from Wrexham, bit further along the coast is Talacre and the 'Point of Ayr' Lighthouse.
For your 'usual' LE type work, you could head up the Wirral, taking in West Kirby Marina and New Brighton ( Breakwaters and Lighthouse), check tide times though, these are little further but less than an hour from Wrexham. Both good sunset locations though, especially at this time of year.