So a lot of people want a full on summer rework, but I'll try to propose something that would drastically improve the season without requiring a lot of work.
•Make cactus immune to wildfires (because it's a desert plant).
•Make reeds permanently wet (because it's on swamp soil) and immune to wildfires.
• Allow the prototyping of desert and fashion goggles, make oasis fishing yield random blueprints instead.
•Make boats fireproof but still able to catch on fire from structures.
I feel like those few changes alone would go a long way to make summer less tedious.