OVAs included with each Yuru Camp△ SEASON 3 Blu-ray/DVD volume. 
Episodes: 

1) The Outclub's Room 
The Outclub girls take a good look at the Five Fuji Lakes and the Yamanashi area. 

2) Rainy Camping 
Rin dares to try her luck camping in the rain. 

3) Rin and Nadeshiko Go Spring Camping at Lake Inaga 
Rin and Nadeshiko indulge in springtime camping at Lake Inaga. 
(Source: Crunchyroll)

Rin and Nadeshiko Go Spring Camping at Lake Inaga

Rainy Camping

The Outclub's Room

Episode 12 - April 2nd: Cherry Blossom Camp Trip

Episode 11 - Scenery from Way Back

Episode 10 - Chikuwa, Trains, Chiaki's Solo Campin

Episode 9 - Touring and Checking Out the Cherry Blossoms

Episode 8 - The Food Porn Begins!!

Episode 7 - True or Embellished? Retrospective Camping

Episode 6 - See You Again Someday

Episode 5 - Campfires and Beef Feasts

Episode 4 - Hatanagi Attack! Death Road from Hell

Episode 3 - We're Off! Land of Suspension Bridges

Episode 2 - Mini Camping and Yard Camping

Episode 1 - Where Should We Go Next?

FuRyu

8-bit

Laid-Back Camp Season 3 OVA