Reservoir Number 4

The water sits perfectly still most mornings, reflecting the Argyll hills like a mirror someone's just polished. Reservoir Number 4 is one of those places that sneaks up on you - not marked with grand signs or visitor centres, just a proper working water supply that happens to be spectacularly beautiful. You'll find it inland from Helensburgh, and it's the kind of spot where walkers stumble upon something genuinely peaceful without fighting crowds.

What you get here is straightforward: a large body of water surrounded by moorland and forestry, with decent walking paths around the perimeter. Bring binoculars if you're into birds - the reservoir attracts all sorts. It's free to visit and the walk takes anywhere from 45 minutes to two hours depending on which route you fancy and how often you stop to look at the view. Go on a clear day. Mist rolls in quick, and you lose half the appeal.

Families with kids who enjoy a proper outdoor walk will get something out of this, though there's not much to actually do once you're here - no facilities, no playgrounds, no café. It's pure landscape. History buffs might find the industrial heritage angle interesting, but don't expect interpretation boards.

If you're basing yourselves at either Rosneath Castle Caravan Park or Hunters Quay Holiday Village nearby, this makes a solid half-day outing. It's the kind of walk you do before heading back for proper tea, not a destination in itself. Worth the drive if you're after some genuine Argyll quiet.