This is a beautiful, scenic park on the south coast of England! If you enjoy nature and walking along the top of cliffs with a view of fields and sea (on a sunny day), it's a breathtaking experience. In September 2023, I took a day trip from Brighton (just one hour via the 12x bus to the Seven Sisters Country Park Visitors Centre).
If you are coming from Brighton, I would recommend stopping by the visitor centre to get a map brochure, stop by the restroom, and ask questions. There are basically 3 options for hikes from the centre.
Short walk to the beach. If you have young children, I would take the flat path along the Cuckmere River for 0.5 miles toward the beach. At this point, you can turn around back to the centre for an easy 1-mile trip, or you can climb a steep trail to join the South Downs Way trail.
Moderately difficult walk to Birling Gap. This trail avoids the beach, but climbs up and down a few hills - you'll open a few gates and cross fields. It's not strenuous, but the hills will feel like climbing stairs. After 45 minutes, you'll reach the cliff edge with water views. Continue left toward Birling Gap as you enjoy scenic views. I think the most scenic part of the hike for pictures was the midpoint (Brass Point) between the seven cliffs. It takes about 1.5 to 2 hours in total to reach Birling Gap (walking along the top of all seven cliffs). When you reach Birling Gap, you can find a small visitor centre for refreshments and a restroom break. You can then catch a sightseeing bus (4 pounds) for East Dean, then walk a short distance to the 12x bus stop westbound for Brighton.
Long difficult walk to Beachy Head. This trail includes the hike above, but you will then continue uphill toward the lighthouse (Belle Tout) after Birling Gap. Keep going until you see a red lighthouse. If you're tired, catch the sightseeing bus at Belle Tout for East Dean. If you're up for more walking, go ahead for another 2 miles to Beachy Head. The views are pretty, but it's about 3-4 hours in total for this long walk (10 miles in total, I think.). At the Beachy Head visitor center, I was exhausted and a bit dehydrated. Glad to have taken a sightseeing bus (4 pounds) for East Dean where I walked a short distance to pickup the 12x bus westbound to Brighton.
Has anyone travelled to Seven Sisters Country Park from Eastbourne? My impression is that it's much easier to see the white cliffs from Eastbourne because of the sightseeing buses which run along the coastal route passing Beachy Head, Belle Tout, and Birling Gap (I suppose you could walk in the reverse direction and turn around at Brass Point - the midpoint of the seven cliffs).