Use Kamakura as a contrast to Tokyo
Kamakura is strongest when it feels different from Tokyo. The point is not to maximize the number of temples. It is to change the rhythm: lower buildings, sea air, older streets and a day that moves more slowly.
For many first-time visitors, Kamakura is a better use of a spare Tokyo day than another dense city itinerary.
Pick one main theme
A good Kamakura day needs a main theme: temples, coast, walking streets or an easier food-and-neighborhood day. You can combine them, but not everything should have equal weight.
A simple structure
Start early enough that the day has room. Put the heaviest cultural stop in the morning, lunch somewhere you actually want to linger, and the afternoon toward the coast or a calmer walk.
When Kamakura beats Nikko or Hakone
Choose Kamakura when you want easy logistics from Tokyo, culture without a heavy day, and a coastal contrast. Nikko is bigger and more demanding. Hakone is better when onsen, Fuji views or an overnight stay matter more.
When to get personal help
Personal planning is worth it if you are choosing between Kamakura, Nikko and Hakone, or if your Tokyo days are already too packed.