I had previously proposed a similar idea regarding the moon, “Around the Moon in 30 Days”. Planet Mercury has also a long solar day equivalent to 176 Earth days. Circumference of Mercury is 15,329 km. This number gets smaller towards the poles. An average travel speed of 3 km/h would cover 12,672 km in one Mercury solar day. If you travel at this speed, you maintain your position relative to the Sun.
The solar rays are very strong and generate very high surface temperatures on Mercury. However, the ray strength changes depending on the altitude of the Sun. As a result, it is possible to select a starting point for the Mercury surface explorer where it would never experience strong solar rays and surface temperatures. If the surface explorer travels at an average speed of 3 km/h, it would experience similar solar rays and similar surface temperatures. The surface of Mercury is not a good thermal conductor and the air is so thin that the heat from kilometers away would not be conducted to where the explorer is. Continuous sun rays allow continuous energy supply. Much higher energy can be generated compared to a rover on Mars. The lack of dense air and winds reduce the dust accumulation on the solar panels.
Continuous communication with the explorer requires Mercury orbiting relays. The close proximity to the Sun, allows the relays to study the Sun while they are orbiting the planet. Multi-purposing increases the value gained from the project and justifies its cost.
Studying Mercury is way easier than exploring Mars or Venus if you plan the mission right. Mercury is closest to Earth more often than any other planet, being Earth's nearest neighbor about 46-50% of the time, despite Venus having closer individual approaches because Mercury's smaller, faster orbit keeps it generally closer overall, never venturing as far away as Venus or Mars do. This allows more frequent Mercury missions compared to other planetary missions.
Exploring the surface and air of Mercury would also reveal some mysteries of the Sun and the fusion.
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