Rattlesnake Gulch Trail is located in Eldorado Canyon State Park. It is a short 20 minute drive from Boulder and is one of three hikes in the park. You will need to pay an entrance fee to get inside to the park which costs $8. The trail is approximately 2.8 miles one way and carries a consistent and gradual incline the duration of the hike. There are a couple places to split from the trail, one will take you to Crags Hotel, a hotel that was built in 1908. The other will take you on a longer trail of switchbacks to views of the Continental Divide. You also have the option of heading straight to the viewpoint without hiking the extra switchbacks if you choose. Either way, it's a loop trail that you can easily navigate through. The views of the divide are spectacular and should absolutely be the ultimate goal of this hike. Please note that the trail consist of dirt and rocks, making the terrain uneven in several parts.