The subjunctive mood is the best.
The subjunctive is rarely used in colloquial English. Totally irrelevant information, but... it is a relic from Latin, where there are many uses for a subjunctive. There is even a special conditional using the subjunctive mood that expresses the exact circumstances you described, which is usually called future less vivid.
One can see through a cactus fence, but it is hard to climb through.
Cactus plants are found at tourist beaches.
Cactus is sharp, which represents the pain the natives feel.
The boy finds the girl and follows them
