Wild swimming spots in the Lake District?

I'm planning a trip to the Lake District this summer and would love to try some wild swimming while I'm there. I'm an intermediate swimmer looking for locations that aren't too challenging but still offer a good experience. Ideally, I'd prefer spots that aren't too crowded - happy to walk a bit further to find more secluded places. I've read about Rydal Water and Grasmere, but I've heard they can get quite busy in peak season. Are there any lesser-known spots that locals or regular visitors would recommend? Also, any tips on the best times of day to visit would be appreciated. Safety is important to me too, so any advice on currents, water temperature, or other things to be aware of would be really helpful. Thanks in advance for your suggestions!