Six honest ways into AniList's catalog — every list below is a live, documented query, not a precomputed or invented recommendation.
"Surfing" isn't one of AniList's fixed genres — searched as a tag instead, sorted by average score.
SPY x FAMILY Season 2
Eureka Seven
Space Dandy
Ride Your Wave
FLIP FLAPPERS
Pokémon Origins
Mermaid Melody: Pichi Pichi Pitch Pure
5 Centimeters per Second
Mermaid Melody: Pichi Pichi Pitch
Eureka Seven AO
Eureka Seven AO Final Episode
Brand New Story
Ein's Summer Vacation
WAVE!! Surfing Yappe!!
Kimagure Orange Road TV Pilot
WAVE!! -Let's go surfing!!- (TV)
Eureka Seven AO: Jungfrau no Hanabana-tachi
Santa Company: Manatsu no Merry Christmas
Surf Side High-School
Dog Soldier