This is a lovely almost flat off-road tarmacced route.
If you park at Bull Beck (see map on children’s page), you can cycle to Lancaster (about 5 miles ).
From there, you can head North to Morecambe (about 3 miles), then onto Heysham (another 2 miles) along the promenade.
Alternatively, from Lancaster, head South to Glasson Dock (about 5 miles).