Garden of Eden (Mile 10). Explore the beautiful and exotic vegetation. There is an entrance fee. [budget at least 1 hour]
Ke'anae Peninsula (Mile 16+). Drive round the peninsula and stop to take awesome photos, and to eat Aunty Sandy's banana bread [budget 30 minutes]. Go slow not to miss the turn on the opposite side of the road, if you miss it, still on the opposite side of the road there is a lookout later that is worth stopping to see the peninsula from above. [budget 5 minutes]
Upper Waikani falls (Mile 19). Take some photos. [5 minutes]
Pua'a Ka'a State Wayside Park (Mile 22). Another photo opportunity with retrooms and shaded tables to eat the snack you prepared at home. The pond formed by the falls can be a good one to swim in. [20-30 minutes].
Hanawi Falls (Mile 24). More photos. [5 minutes ]
Ka’eleku Cave (Hana Lava Tube). Turn at mile 31. Especially if you have kids who are excited about the idea of being in a pitch dark lava cave. If the idea doesn't excite you, then skip it. There is a entrance fee. [1 hour]
Wai'anapanapa Park (Mile 32). Last stop before Hana. Our second favorite stop, with water caves, black sand beach, hikes etc. [1 hour]. They have now added a reservation system for this, so you need to plan ahead what time you'll get there (which we think is near impossible, but we don't make the rules)
Hamoa Beach (Mile 49). First stop past Hana. If you love playful waves then you'll love this beach [1 hour]. Otherwise, especially if it is getting late, drive down to take photos from the top, and continue round to get back on the highway. [10 minutes]
Wailua Falls (Mile 45, yes the numbers go back down). Yet another beautiful waterfall. [15 minutes]
'Ohe'o Gulch (Seven Sacred Pools) and Pipiwai Trail. (Mile 42). At Kipahulu entrance to Haleakala National Park. Our favorite stop mostly due to the Pipiwai Trail leading up to Waimoku Falls. You have to pay to enter the national park and the ticket is valid for 2-3 days, so you could plan to reuse it to visit the top of Haleakala. [budget for as many hours as it will take you to hike 2 miles up to 800 feet elevation, and back]
Palapala Ho'omau Church. (Mile 41). If you are interested, stop to see Charles Lindbergh's grave. [15 minutes]
Drive the rest, from Kipahulu to Kihei Akahi D-211. The drive on this side of the island (aka as the dry side) is very different to the drive you have done so far. Instead of a lot of green vegetation, you can see as far as your eye goes and enjoy the majestic coastal and ocean views from your car windows. That is if you are the passenger, because the driver will need to keep their eyes on the road and their hands on the wheel, especially on some of the unpaved parts of the road in this area. [2 hours]