Vintage Green Lake Postcard

Hattie Sherwood Park is just west of the city of Green Lake and has been a popular swimming destination for generations.
This postcard is postmarked August 9th, 1945 from Green Lake.
Addressed to:
Mrs. W. W. S. Carpenter
210 S. Elmwood Ave
Oak Park, Ill

Text (sadly cut off by my cheapo scanner)

Dear Grandma -

I'm sorry that I forgot to write you all the time. We had fun on the mail boat ride yesterday. Will write tomorrow.

Love Jane.

(Thankfully the old Victorian home still stands at 210 S Elmwood. According to Google Streetview anyway)