Soon after the jetty is Adachi Park, a Japanese themed garden with picnic areas and a playground. The Japanese theme of the park and the name signify Belmont's Sister City, Adachi in Japan. There is also a Belmont Park in Adachi. I did a bit of a Google search on Adachi, I couldn't find Belmont Park, but I did discover that Adachi is Tokyo's most northern ward and is surrounded by a number of rivers including the Sumidagawa and Arakawa. If you want more info about Adachi and the exchange click here.
I wonder if Belmont Park in Adachi is also on the bank of a river, and a balding Japanese equivalent of me with an interest in metrotrekking is walking through it right now. Eerie ... but probably not. Anyway, Adachi Park is a beautiful little area and I especially like some of the interesting paths, definitely not wheelchair accessible though.