Two recent opportunities to go to Niagara on a Friday.
Port Colborne Farmers' Market has much to recommend it: every Friday except New Year's week, 6am - 1pm, opposite City Hall at 66 Charlotte St (which has public washrooms). Free parking at downtown meters during market hours (got a good spot both times).
Produce vendors appear to be (almost) all growers - I'm suspicious about one ;). Several organic.
Sylvia's bakery from Burlington is there with fabulous poppyseed Kipfli, & several other vendors who also sell at the Saturday St Catharines market.
When you've shopped, go back toward the canal & turn right: Minor Fisheries sells fresh off their own boats filleted yellow pickerel, yellow perch ~$10/pound & dressed smelt. Also fries them beautifully, served with good homemade cole slaw, ok tartar sauce. Fries on Friday were not great as they seemed to be fresh-made from local potatoes, so too wet & waxy - too seasonal - what a nice complaint :).
Cross the street to sit on a bench by the canal, or drive down the end & around the corner to park at Sugarloaf Hill. Top it off with a box of raspberries to pick at.
Brought fish home, variously dusted in seasoned flour and/or cornmeal & sauteed in oil+butter,, served with my go-to tartar sauce (Bon Appetit, Jan 1999), radishes & slabs of beefsteak-type tomatoes from the market- heaven!