@Skinal
I looked at the file of another mod and found that this will update the Happiness Yield:

<Features>
<Update>
<Where Type="FEATURE_REEF"/>
<Set InBorderHappiness="1"/>
</Update>
</Features>

Hello, nice work. I try to change myself some values but i don't find how to do with Happyness which doesn't seem to be listed in the YieldTypes

@gmdaoust No problem. Mods like this are actuallly very quick and easy. If you ever want to change the yield of a tile/improvment/building, the process is very easy, and you should consider trying it yourself! I'm glad you liked it!

Thank you very much for this mod. I have been searching for just the like. I too felt that some Natural Wonders left a lot to desire when compared with what I can achieve with a tile, given time. It's a WONDER, for crying out loud. It should be wonderful. Of course, there is always Spain, but you can either shun it, of consider choosing it as added piquant to a game, knowing full well that if they set their hands on one of these, your carrots are cooked. Especially at Deity level, my favourite difficulty level. Anyhow, I'm glad you took the time to create this mod.

@JEELEN Read the description.

@bends11 I didn't click on any mod. And I don't quite see how increasing bonus will give a greater balance. As in 'Natural Wordl Balance'?

The natural wonders do not need to be perfectly balanced, but if they are to be called wonders, it should be a priority to settle near them. In my opinion, the wonders that I changed were not good enough to prioritize. The description explains why I made each change. Even with the changes, I still have these as the worst natural wonders.

If you feel that Spain is an overpowered civ, then you could just not play with them, but the whole point of Spain is that they have a chance of having a game breaking start if they find a natural wonder.

If you disagree with the notion that natural wonders should be balanced, why would you click on a mod titled "Natural Wonder Balance"?

Why would natural wonders be balanced at all? And how is your modification making them more balanced? (For instance, the Spanish double all natural wonder yields.)