Cusuco Expeditions (tel. 504/9907-4605 or 504/9771-9049, cusucoexp [at] yahoo [dot] com) is a relatively new business, but its 40-odd community guides have been bringing people through Parque Nacional Cusuco [1] for more than five years. Some guiding is available free of charge at the visitors center. Although guides are not necessary to navigate the main trails, they can be of use in helping spot animals and birds.
Cusuco Expeditions can also provide information on transportation to and from the park.
Links:
[1] http://www.moon.com/destinations/honduras/central-honduras/san-pedro-sula/parque-nacional-cusuco