**No. A C-1 transit visa does not authorize a trip to Miami to visit friends, even for just a couple of days.** It permits “immediate and continuous transit” through the U.S. on your way to another country. The State Department specifically says that visiting friends requires a visitor visa. [U.S. transit visa guidance](https://travel.state.gov/content/travel/en/us-visas/other-visa-categories/transit.html)

“Multiple entry” lets you use the visa for repeated qualifying transit journeys during its validity. Each journey must still meet the transit requirements.

For your planned Jamaica–Miami visit, you would generally need a **B-2 visitor visa or a combined B-1/B-2 visa** before traveling. Visiting friends is an expressly permitted purpose under that visa category. [U.S. visitor visa guidance](https://travel.state.gov/content/travel/en/us-visas/tourism-visit/visitor.html)