San Juan Cosalá and its hot springs
The town at the foot of the hill, and the one you are technically staying in.
What it is known for all along the lakeside is thermal water. There is a public hot-springs spa on the lakefront with several pools at different temperatures, jacuzzis and a natural steam cave (a temazcal). It is genuinely hot, geothermal water, and it is the reason people from Guadalajara drive down for the day.
Raquet Club's own description mentions thermal water reaching houses in the development on some days of the week; we can't promise it for this house or for your dates — ask us and we'll tell you what applies. And check with us on the spa before you get in the car — we'd rather confirm it for you than have you drive down to a closed gate.
Photo: Graciela Gallardo Hernandez / Google