Lassen Volcanic National Park
National park of the United States.
Each edition grades its towns against each other only.

Roughly 764K visitors a year make it to Whiskeytown-Shasta-Trinity National Recreation Area. With nothing inside Happy Valley, the list has 6 places within 40 miles. There are 2 museums, a national forest and a theatre to choose from. Make a day of it at Lassen Volcanic National Park, 43 mi away.

National park of the United States.
The towns around it, and where to stay →
Out of town, most of the 6 are to the northwest.
Orange: Happy Valley. Numbers: the best-known places, matching the list below. © OpenStreetMap contributors
Nothing is inside Happy Valley itself; these 16 are within 60 miles.
National park of the United States.
State park in Weaverville, California.
National Recreation Area located in northern California.
Ranked by how many people look them up, so the famous places lead and the local favorites follow.
Parks and trails in Happy Valley →
Lassen Volcanic National Park: en:User:Mav, CC BY-SA 3.0 · Lassen Peak: Frank Schulenburg, CC BY-SA 4.0 · Burney Falls: Dvortygirl, CC BY-SA 3.0 · Bidwell Park: Saopaulo1 at English Wikipedia, CC BY-SA 3.0 · Shasta–Trinity National Forest: Unknown, CC BY-SA 3.0 · Mossbrae Falls: Pinecar at English Wikipedia, Public domain · Weaverville Joss House State Historic Park: Frank Schulenburg, CC BY-SA 4.0 · Turtle Bay Exploration Park: DimiTalen, CC BY-SA 3.0 · Cascade Theatre: Publichall, CC BY-SA 3.0 · Whiskeytown-Shasta-Trinity National Recreation Area: RoyalMayfair, CC BY-SA 4.0 · Mount Shasta City Park: Daniel Mayer (talk · contribs), CC BY-SA 3.0 · Chico Air Museum: Bsudicky, CC BY-SA 4.0 · Loomis Museum: DimiTalen, CC BY-SA 3.0 · Dunsmuir Botanical Gardens: Daniel Mayer (talk · contribs), CC BY-SA 3.0 · McConnell Arboretum & Botanical Gardens: Daderot, CC0 · Museum of Northern California Art: Frank Schulenburg, CC BY-SA 4.0