Sidney is a town full of bookstores and coffeehouses. Competition is fierce. I'm a big fan of Serious Coffee, but Toast Cafe is the closest to Beacon Inn, where we always stay (best B&B in Sidney). The place is roomy and friendly with a very good decaf mocha. We got a sandwich for the ferry. The key is that Toast is not on the main commercial street (Beacon) where most of the other coffeehouses are. It is one block over. If you are walking into town from the ferry, it is three or four blocks to your left on Bevan Avenue. It's worth the walk.
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