I assume you are at the campsite by Glencoe Village? Leven itself is quite scenic, if a little limited at 20 odd knots - you soon get to the other end!
If you head out under the bridge you are in Loch Linnhe. You don't need a chart to tell you the current through there can be quite strong, but once out into Linnhe If you head out and hang a right (using the correct nautical terminology here!
you go through another set of narrows (mind the ferry!) and it's pretty much a straight line to Fort William, thence on to the top of Loch Eil.
If you "turn left" (more like straight on) then most of the "eateries" are on your Port side - The Holly Tree (has a pier) Just before Kentallen Bay, then on past the Isle of Shuna to Port Appin where the place by the Pier does good food. From there if you go into Loch Creran you can (I think) now visit the sea life sanctuary by boat as they were building a Jetty when I was there last August. FWIW I have done approximately that trip in an 11 foot dory, so unless the weather is utterly yuk should be doable in your rib.
Just be aware Loch Creran is pretty much all a nature conservancy area, so dropping anchors is an absolute no in all but a couple of small areas. - http://www.argyllmarinesac.org/pdfs/anchoring.pdf
for the details. (it doesn't look very restrictive, but it will make more sense once you see the chart!
If you are feeling adventurous / have all day and carry on south down Loch Linnhe it's next stop Oban or the Connel Bridge.
If you head down the West side of Linnhe the shoreline is much more sparsely populated., if you prefer to be "out in the wilds"
So yes, plenty of cruising round there. I'm sure the locals will be along soon to add to my "tourist list".... Just be aware there is not a lot of shoreside fuel round there.
Have a good holiday.