USGS National Map Viewer - The National Map Viewer allows you to access an enormous map of the entire United States, maps can be downloaded in .pdf format at no cost, topographic maps are integrated into the map and geographic names and places can be found for almost any area.
Google Earth - Everything from Panoramio photos, GPS track mapping, road maps, state and national forest and park locations and boundaries, current traffic conditions, real-time locations of the sun and the ability to create, maintain and share your own maps make Google Earth an invaluable tool.
Panoramio - Panoramio’s massive database of user submitted photographs is integrated as an optional layer in Google Earth and photos of many trails, waterfalls, scenic views, lakes and pretty much anything else can be found.
NOAA Solar Calculator – This handy tool utilizes Google Maps and allows you to zoom in on any point on the planet and calculate the exact position of the sunrise, sunset and current position of the sun at any time
Astronomical Applications Department - This webpage maintained by the Astronomical Applications Department of the United State Navy allows you to input the name of a city or town and get the complete sun and moon information for that day, their database of cities is rather small so you’ll have to use larger towns or cities.
Trails.com - You do have to pay a yearly subscription fee however you are then granted unlimited access to trail information and professional guides, information on everything from campgrounds, hiking trails, nature trails, white water kayaking locations, waterfalls, surfing hot spots to the best places for bird watching and more can be found here.
Alltrails.com - Similar to Trails.com this site features more user submitted content but has a larger variety of trails and activities for different areas.