Translation of spulen

Today the spring really showed itself. It was over eighteen degrees and people started wearing nice and with T-shirts. Snow has melted and the temperature is steady. I can't wait for the summer.
Sunday is fine. Please let us talk tomorrow to arrange a schedule of that day. I will call you tomorrow, but in any case, here is my number again. We could do it also on Monday next week, if it fits everybody.
Swimming in the open water was refreshing and fun and some of us jumped of the roof of the boat into the deep waters. After another snack break the four of us were invited for a Kayak excursion.