Key Tours (00 30 210 9233166, www.keytours.gr) offers excursions to all of the following destinations.

Parker offers at least six two- or three-day excursions to the areas that you mentioned.

River companies offer excursions of various duration, from a day to a couple of weeks, and with different objectives.

All cruise lines offer excursions in the port cities visited by the ship.

Most hotels offer excursions including half-day entry to the lagoon.

Most hotels offer excursions into the dunes and it's here that they make their money.

Ships generally offer excursions in port, usually on buses that are not accessible for the disabled.

Do you know of organizations that offer bus or walking excursions?

Steamboat companies offered excursions along the Delaware as early as the 1830's.

In addition to offering daily excursions onto nearby rivers, the lodge also runs a trek into the jungle.