Do you know if they have trail at West Maui forest?
There are tons of trails on Maui, but most of them are off Haleakala. If you look at a topography map, you'll understand why.
If you really want to hike West Maui, I'd start with the Iao Valley trails, because they're well hiked. Unless you're a very experienced hiker, proceed with caution on less popular trails, and wear good hiking boots. (Or hire a guide -- that's what we did.) West Maui mountains are much steeper than Haleakala and very slippery because of the constant rainfall. You don't want to slip and end at the bottom of a gulch.
Here's a great site with more info:
http://www.everytrail.com/best/hiking-maui-hawaii
I saw Pipiwai Trail on trip advisor...look like far away from kaanapali, i think we will go after the sunrise at Haleakala. its is possible?
The road to Hana itself takes several hours, and it's a very fatiguing drive because you have to pay attention the entire time. There are tons of hairpin turns, not to mention knuckleheaded tourists driving like Grandmas, who don't have enough sense to pull over and let the others pass.
While it's technically possible, I definitely wouldn't want to get up at 2:30am to see sunrise, drive the road to Hana, hike for a half day and then drive back to Ka'anapali all in one day. I'd either do sunrise and then drive the road to Hana, or I'd drive the road to Hana, hike, and then drive home. But I wouldn't attempt all 3 in one day. Nor, incidentally, would I want to be on the Road to Hana (or the road past Hana, if the bridges allow it) past dark.
Another caution is that you must be aware of the weather above you (e.g. at the summit), when you're around Haleakala because when there is a risk of flash flooding. If you drive the road past Hana, look toward the mountain before driving on any surface where the asphalt is missing. It's not paved for a reason.
What time do you suggest to leave the resort if we want to see the sunrise?
Ask the concierge, but IIRC ~2:45am. You'll want to be there well before the sun rises to see the colors change. Dress warmly. If it's raining, it may not be worth the trip.
We would like to rent paddle board, can we rent at the resort ?
Yes.