And for their beach date they of course go to Enoshima!
Man, I miss Japan.
How can you tell that's Enoshima?
There's the telltale Enoden train, with the tracks and road along the coastline, and the island shown is clearly Enoshima with the Sea Candle on it, plus you can see the Benten bridge leading up to it.
Well, technically they're on Katase Higashihama beach (which is featured a lot in manga and anime), but I'd say it's close enough to Enoshima to count.