Pick the right park, and the right weekend

Britain has fifteen national parks, and several of them put you within a short stroll of salt water. Pembrokeshire Coast is the only one that is wholly coastal, but Eryri, the Lake District, Exmoor, the South Downs, Northumberland and the Norfolk Broads all offer coastline inside or just beyond their boundary. That matters if you want to combine a clifftop walk with a proper hill day, a swim in cold clean water, or an evening in a harbour pub.

Timing is everything. Late May, June and September give you long daylight, drier paths and far fewer people than the school summer holidays. If August is your only option, aim for a Sunday-to-Tuesday break rather than Friday to Sunday, and expect the car parks in the honeypot valleys to be full by half past nine in the morning.

Book early — beds, pitches and tables

Accommodation in and around the parks is limited and sells out quickly. For a summer weekend, book three to four months ahead; for bank holidays and half terms, six months is not excessive. Think beyond the obvious: a room above a village pub, a bunkhouse, a shepherd's hut, a small campsite with one tap and an enormous view. Pitches at quieter sites often cost £12–£25 a night for two people, while pub rooms with breakfast tend to start around £90 and climb steeply in July.

Once your bed is sorted, book the rest. Many village pubs stop serving food at half past eight, and the good ones need a table reserved a week in advance. Some car parks take advance bookings for summer weekends — if they do, use it. It is far better than circling a full car park at ten in the morning while your walking boots sit unused in the boot.

Leave the car behind where you can

Gateway towns on the edge of the parks are usually served by rail, and from there a network of seasonal buses, park-and-ride services and foot ferries will carry you into the hills and along the coast. This is more than a virtuous choice: it is often the only sensible way to enjoy a linear coastal path. Walk eight miles one way, catch a bus back, and you never retrace a step or argue about who is driving.

Check timetables before you book accommodation, not after. Rural services can run four times a day in summer and vanish altogether in winter, and a Sunday service may not exist at all. If you are driving, fill the tank before you enter the park, and treat single-track lanes with respect: use the passing places, pull in for locals, and never park in a gateway or on a verge that is soft enough to churn.

Plan the walk around the tide, not the clock

Coastal walking is different from inland walking, and the tide table is your first tool, not your last. Beaches that look vast at low water can be cut off within the hour. Estuaries and causeways flood fast, and a rising tide can pin you against a cliff with no way up. Check the times for the specific stretch you intend to walk, and never assume yesterday's timings still hold.

Allow for the ground underfoot, too. Coastal paths are relentless — short steep climbs, hundreds of steps, slippery clay after rain. Eight to twelve miles is a full day for most walkers, and that is before you stop for a sandwich with a view. Carry a paper map and a compass, because phone signal on cliffs is patchy at best, and tell someone your route and expected finish time. Check for temporary diversions as well: cliff falls and erosion close sections of path every year, often with very little warning. In winter, dusk arrives before half past four, so start early and finish with an hour of daylight to spare.

Spend your money where you are walking

Tourism keeps upland farms, village shops and rural bus routes alive, and small choices add up over a weekend. Buy your lunch from the village bakery or farm shop rather than a supermarket on the way in. Drink in the pub, refill your bottle at the café, and carry some cash — honesty boxes and tiny campsites still do not always take cards, and a signal strong enough for a card machine is never guaranteed.

Owner-run guesthouses, bunkhouses and campsites tend to employ local staff and buy from nearby suppliers, which keeps more of your spending in the area. Ask at the counter what is worth doing; the best advice on quiet paths, good swimming spots and where the weather usually breaks rarely appears online.

Tread lightly in protected landscapes

National parks are working landscapes, not museums, and the people who farm and live in them are part of what makes a weekend there feel different. A few habits keep it that way.

• Stay on the path. Cutting corners widens eroding scars on cliff tops and moorland that can take decades to heal.
• Keep dogs close and on a lead from March to July, when ground-nesting birds are on the cliffs and in the heather, and around livestock at any time of year.
• Leave gates as you find them, take every piece of litter home, and skip disposable barbecues and fires altogether — one spark can destroy a hillside.
• Give wildlife room. Seals, ponies, adders and nesting seabirds all need distance, and drones are restricted or banned in many protected areas.

Book early, travel by train and bus where you can, spend in the villages you pass through, and you will get far more out of a weekend than a tick-list of summits. You will also be helping to keep these landscapes worth returning to, season after season.