I used to live on the south coast, so I had the best of both worlds, plenty of lakes and rivers and the sea.
I personally find fly fishing and spinning much more enjoyable than coarse fishing. But nothing tops sea fishing, especially when you make things more difficult for yourself
I remember I used to go pier fishing in Newhaven, I used to take a beachcaster for getting mackerel, bass and cod and a lightweight freshwater match rod for having some real fun.
If you really want a challenge try this:
Get the most flimsy, lightweight match rod you can with get some 1-2lb line.
Set up a sea float, with a 2m depth for the bait.
Bait a thin but long strip of mackerel.
Keep floating just around the edge of the pier.
Wait for the garfish/bass to bite.
I can tell you, hooking a 2lb garfish or a 5lb bass and watching your match rod bend in half, having to play it careful is so much more enjoyable than landing a 34lb carp with £100s of equipment - I've done both.