Yama no Susume 2 END
One of the reasons I praised the original short series was due to the length of each episode there never felt like there were dead periods throughout the show, with the increase to 15min episode and twice as many episodes there was the risk that they'd lose this positive. Luckily it seems the show makers managed to never make a dull episode and each moment served a purpose (well episode 15 was a bit odd with its bait and switch, but it did introduce important elements).
When they aimed for Mount Fuji half way through one wonders how they'd top scaling Japan's highest mountain for the rest of the series but the ending arc was a lovely way to end the series and I think a perfect show ending. While I enjoyed the show I feel this is a perfect place to end it and there is no need for a third series. Some may find it odd they introduced a new character right at the end, but her purpose makes sense, Aoi was somewhat of a loner at the beginning and by the end of it she is the one to approach someone and become friends with them. It's just another mountain she scaled.
Also one thing that was very interesting is that we see parents a lot of the time and they're not even background characters. This is like a miracle when it comes to Japanimation.