The kids and I did a hike a couple of Augusts ago mid-week, maybe Thursday, and there was barely a spot open then. Through Columbus Day you'll find lots of weekend traffic. Most of us on the hiking boards don't think of hiking as having a season but after Columbus Day until winter starts may be the least crowded time to hike except for April when the snow is melting.
If you need those three for the list then you'll need them. If just looking for a long hike over a couple of peaks and you have many choices, I'd opt for someone else if that is your weekend to go. Generally, you can park at the Ausable Club with an early morning start since there should be few overnght cars from camping. Sawteeth, Pyramid & Gothics is great & the view from the lake is wonderful. UWJ, Armstrong & Gothics rugged and with views too. Foe the Garden, you get people staying at JBL and nearby in there on Thursday & Friday.
My experience with foliage hiking is that lower open summits are usually better than the highest peaks. High above treeline, the closest trees are fir, spruce & then birch. Green & then brillant yellow. Birch is nice but they are all the same color. The maples are the ones with reds, yellow & orange. They are amongst the lowest points. Moxham & Goodenow would offer great views from below 3,000 feet. The peaks around Lake George, would be nice also though they may be peak closer to Columbus Day. If looking for a tougher hike, the Tongue range should be fine with great lake views.
Closer to Keene Valley, Snow, Baxter, Hopkins, & Rooster Comb & Round.