The Mangapapa River drains into Lake McLaren near Tauranga in the Bay of Plenty region, and the most accessible paddling on the river is the Mangapapa Canyon, reached by paddling across Lake McLaren from its launch point at Taniwha Place, approximately 10 minutes from central Tauranga. The canyon section is characterized by sheer cliffs rising from deep water, with native bush growing densely along the walls and canopy closing overhead to create a cave-like effect. Birdlife is present throughout the lake and canyon approach. The canyon is also notable for glowworms visible on the cliff walls during evening tours.

Guided kayak tours of the canyon operate year-round, with daytime departures at 9am and evening glowworm tours also available. The total paddling time on guided tours is approximately one and a half hours. The canyon is considered suitable for general visitors when accessed via the lake route on guided tours.

The upper Mangapapa River, above Lake McLaren and Lake Mangaonui, presents an entirely different character and is strictly for advanced paddlers. Kayaking on this section depends on rain events to raise water levels, as normal flows are insufficient for paddling. In extreme flood conditions, the upper river is described as extremely hazardous. Access to the upper river is also physically demanding, with riparian access described as very difficult. The river's headwaters on the Mamaku Plateau hold trout habitat of regional significance, though angling access requires experienced bushcraft.

The river is part of the Kaimai Hydroelectric Power Scheme (operated by Manawa Energy), which affects flow levels in the upper catchment. Paddlers considering the upper river should be aware that scheme operations can influence water availability.