my town is terrible for it and thats the pavements.. when i lived in scotland there used to be designated buggy type things that went around cleaning it up and washing the area.. tho i dont see why tax payers should fund that sort of set up... given the current state of the economy most cant afford to keep themselves never mind a dog!
my neighbours are proper mingers.. they ( as i do) have 2 dogs and they are let out 3 times a day ( on the dot.. the first being 6:30am-bloody yappy stupid things they are

) and they havent picked up a single bit of doings since the summer!! over the hot period we had recently my family wernt able to barbeque due to the stench..they never walk the dogs but if they cant be bothered to keep there own garden clean then i guess they wouldnt bother on the beach, local park etc
i have small kids and go mental if i see an owner that fails to pick up..they need a boot up the hello!
we have lots of signs.. have never heard of anyone be fined.. theyre as useless and disregarded as the 'no ball games' signs lol
its not a pleasant job .. picking up i mean, but its a must regardless of threats of fines