What else are you gonna do other than take her to the river?
While it is true Tinkham was along for the morning's hike, it's also true that she didn't get to swim. It's not that the mostly-frozen lake was too cold, she would gladly have gone in, but that it was too hard to get in and out of thanks to the high snowbanks all around the open water.
So of course we took her for another walk along a river where she could get a little wet. Along the bank, we'd throw a stick into the deep water of the river. She'd spring to the edge and yeet herself into the chilly water. A moment or two and she'd come bounding back up the slope with the stick we'd just tried to dispose of. Sometimes she'd even give it back so we could throw it again.
Since it had hardly been much of a walk to get to the river, we continued along the trail through the thick green that our wet winters and springs produce. Tink wasn't nearly as excited by this section as C and I were, but she didn't pout. She did make us stop at the river again on the way back, though.