Part 1 — you're here
Part 2 — >3185122

Text (in case the font is too hard to read):

-+=-Dear Marble and Limestone,
Dear Cloudy Quartz and Igneous Rock Pie,+=
We are pleased to invite you all to our wedding. The ceremony will be taking place outdoors, right in the heart of nature, just like we are accustomed to. Join us in sharing the joy of this special day.
We will be looking out for you all in Ponyville on the 19th of August, over at the Sweet Apple Acres.
-+=-With all our love,
Big Macintosh and Sugar Belle+=
P.S. — We're sending you a stack of 4 fresh apple pies, plus 1 extra in case the delivery fella's belly starts a-growlin.