Having said that Long / Goil are about as close to a Fjord as you'll get on the Clyde if you are into scenery.
Used to be a good Chip shoop at Lochgoilhead (jetty access, so again no dinghy required) but not been ashore there for ages no idea if its still around or not. Other thing to watch is the Mod Plods. If you stick to the Western shore of Loch Long (i.e away from the MOD stuff) they are less likely to have a conversation with you about your speed. I think (can someone confirm / correct me?) the limit in The Loch Long / Goil area is 12 Knots.
Again if you are looking for a "light snack" There are good Chip shops on the fornt at Largs (the Viking) and Helensburgh (I forget it's name, but bear right at 45 degrees when you come off the pier) Another good one in Rothsay, but it's up a back street and ideally you need someone to sit off with the boat so you don't get charged for mooring! (Do I sound like a Chip addict?
If your boat is on the trailer, Oban is not a huge drive from Inverary - probably 45 mins - an hour (assuming you don't know the road & / or get stuck behind a lorry). Plenty of places to launch (Puffin, Dunstaffnage marina, the beach at Taynuilt just for starters), so could maybe spend one weekend pootling about on the west coast?