Re: Thinking about duluth this coming weekend
There is parking down there, but it isn't free and it is usually full. Your best bet would probably be to try and park at the DECC or at the Aquarium and take the DASH if you have to (all should be handicap accessible although I don't know about the trolley). You could also park at Wal-Mart and take the #10 or #10H bus down the hill easily enough and at $.60 it's not going to break the bank.
There is a new restaurant down in Canal Park called Hell's Kitchen that is supposed to be good. I haven't eaten there...yet. I think you're spot on with the Vista Cruise idea. I've always enjoyed it.
I won't be around town this weekend because I'm taking the bus to a wedding in MEdora, North Dakota so you're also more than welcome to use my driveway as a basecamp if you'd please. I'm on the 800 east block of 5th st. so I'm not far from downtown, but it's a long ways to walk (though I've done it). You certainly wouldn't want to walk to Canal Park from there, but the bus routes are close by. Or you can just brave the traffic and take your bus down there. If you were to get into town early enough in the day I don't know that parking would be that horrible.
The DTA has trpi planners on Google now as well just as an FYI.