National Parks Capital Improvements Act of 1996 - Authorizes the Secretary of the Interior to enter into a memorandum of agreement with an entity to act as an authorized fundraising organization for the benefit of the Grand Canyon National Park and any other national park designated by the Secretary that has an approved general management plan with capital needs in excess of $5 million. Requires the organization to issue taxable bonds in return for a park surcharge. Exempts the United States from liability for such bonds.

Authorizes the Secretary to permit the Superintendent of the park to charge and collect, in addition to the entrance fee, a surcharge of not to exceed two dollars. Requires: (1) the surcharge to be used by the organization to amortize the bond issue, to provide for the reasonable costs of administration, and to maintain a sufficient reserve consistent with industry standards; and (2) any excess funds to be remitted to the National Park Foundation (NPF) to be used for the benefit of all National Park System (NPS) units.

Allows bond proceeds to be used for a park facility that is consistent with: (1) the laws governing the NPS and the park; and (2) the general management plan for the park.

Requires interest earned on bond proceeds to be: (1) used by the organization to meet reserve requirements and defray reasonable administrative expenses; and (2) remitted to the NPF for the benefit of all NPS units, to the extent funds are available in excess of the amount required for projects.