The Fan is not a dangerous part of town...
Anyways, tell your friends to check out:
For gardens, try Maymont, Lewis Ginter Botanical Garden, maybe Virginia House and Agecroft Hall.
For historical things/museums, try the Edgar Allen Poe Museum, Virginia Holocaust Museum, Richmond History Center (Valentine Museum), American Civil War Center at Historic Tredegar, Virginia Historical Society, Virginia Museum of Fine Arts (undergoing major expansion and renovation so gallery offerings may be a bit limited), Science Museum of Virginia, Virginia Center for Architecture, etc etc
For interesting shops, try Carytown, Shockoe Slip, Shops at Libbie and Grove, etc
Kayaking... if they bring their Kayaks they can tackle the James River's Class I-IV rapids... or perhaps they can go on a white water rafting tour.
Welcome to Riverside Outfitters
If they like beer, they'll love Capital Ale House which is downtown on Main between 6th and 7th. Legend Brewing has killer city views from their outdoor patio.