Not much going on near the St Marteen Pier, you have the twon to your left, not sure what there is to the right, a taxi may beable take you as most are minivans. You can walk to town, walkway is wide enough for a wheelchair. The town is full of stores for electronics, alcohol, souveniers, clothes stores etc.
I think the key to this question is "the pier". You can now dock at St Martin, but it isn't the same little pier the tenders used to use. It is a pretty long walk along the pier to the City center. (200 yards?)