While on the drive up from the A9 and Pitlochry (its one road in, one road out round here folks), you will pass two other lochs which can be paddled. Loch Tummel and Dunalastair Water. Dunalastair is a good bet on a windy day, when a SUP may be a mission on Loch Rannoch, due to its shallow waters and sheltered location. Loch Tummel has similar stunning views like Rannoch, the easiest access points are to be found at the campsite you pass just after Queens View visitor centre, or take the (even) quieter road along the lochs southern shore, where the Hydro dam and the Sailing club are good bets.