There are many great spots on Loch Lomond. Our personal favourite is on the East side of Loch Lomond (usually quieter than the West) at Milarrochy Bay. There are nice walks along the edge of the Loch (actually part of the West Highland Way) and picnic spots. The car park is situated about 2 miles from Balmaha where there is an information centre and toilets.
There is also a nice walk around the Loch at Balmaha itself and another popular spot is Luss on the other side of the Loch.
Many also come for the watersports - windsurfing, canoeing, fishing and sailing.