I really spent a lot of time at the Summer Festival this year, despite of still not caring that much about any of the rewards. It was just fun. Nonetheless I ended up getting myself the full Sunite outfit as well as the water horse, simply because I could.
My only gripe was that they gave the festival an unexpected extension... why did this annoy me? Because one of its main currencies, Fireblossom Petals, are only temporary, and I had spent all my leftovers on what I thought was going to be the last day. If I had known that the festival was going to continue for another couple of days, I would have saved them and would have ultimately been able to afford another one of the nicer items.