Where do I find the money to the join the School?

Hint 1 of 10:

The leader of the school told you where to find the money.

Hint 2 of 10:

It's in the Temple of Bu.

Hint 3 of 10:

It's in a part not normally accessible to visitors.

Hint 4 of 10:

You need to go down the hole that's in a fenced-off area of the park.  There
are two ways to get there.

Hint 5 of 10:

One is just to jump into the park and into the hole.  You can't jump over the
fences from the inside, but you can reach that area while you're standing
outside the park.