For some reason, the buses that transport groups of kids to the Maritime Aquarium head over to Vets Park for parking. Before the Parking Authority Parks and Rec charged out of towners with a $5 fee, this arrangement seemed to have worked. Since the $5 fee though, buses are opting to circle around Vets park and park on the streets. Not surprisingly this has residents eager to ban bus parking on the narrow streets. The solution seems to be rather simpler, the Maritime Aquarium should work out a deal to obtain a special bus parking pass to give to bussed groups. The Maritime Aquarium likely has records of how many groups come in each month by bus, and thus can estimate how many passes it would need, and based on that number, the Parking Authority Parks and Rec could determine whether it would offer these passes at full price, discounted or free.
UPDATE: I mistakenly said it was the Parking Authority who started the $5 fee, it was Parks and Rec.
