To determine how many people prefer hiking but not in the mountains, we need to look at the preferences for hiking at the seaside and at the island.
According to the table:
- Hiking at the seaside: 20
- Hiking on the island: 12
Now, we can add these two preferences together:
20 (seaside) + 12 (island) = 32
Therefore, 32 people prefer hiking, but not in the mountains.