Long Riders!, Amanchu! Recommendations
Amanchu and Long Riders share a similar scenario/plot and characters. In each our main character is learning something new and trying a new sport/hobby. Amanchu has diving and Long Riders is about cycling, the main character of each show is very new or never tried the new sport and has a friend to teach them everything there is to know while making new friends along the way. If you enjoyed the relaxed slice of life vibe from either show I would recommend the other.
Similiar vibe and synopsis.
Cute girls doing their cute hobbies (scuba diving for "Amanchu!", cycling for "Long Riders!"). One of them is new into it, so the second teaches her.