FYI Park is open from 7 am to 9 pm but the trails are only open from dawn until dusk. I hiked the trails with a friend the day after attending a wedding in the Lodge. Absolutely beautiful, interesting trails with a ton of elevation changes.
Hours from the website (http://www.nps.gov/grca/learn/photosmultimedia/colter_wt_photos.htm):
Desert View Hours - Summer 2015
Watchtower (and Grand Canyon Association Bookstore) 8 am–8 pm
Trading post/Snack Bar 9 am–4 pm
Desert View Market 8 am–5 pm
Desert View Gas Station 9 am - 5 pm. Fuel, including diesel, available 24 hours a days with a credit card
Desert View Campground Open for the summer (First come, first served - no reservations)
FYI Park is open from 7 am to 9 pm but the trails are only open from dawn until dusk. I hiked the trails with a friend the day after attending a wedding in the Lodge. Absolutely beautiful, interesting trails with a ton of elevation changes.