El Salvador 4 days

Gringo heading to your beautiful country next month. Have about 4 days and planned on renting a car.

Spanish is ok for basic stuff (directions, ordering, buying stuff, greetings, etc) but looking forward to practicing by immersion. But can’t ask this question fluently in Spanish. I have been to a few nearby Latin American paises before.

I plan to do a mix of the beach, city, volcanos/mountains, and something else.
Looking for a good loop around the country. Arriving around 8pm and leaving around the same time so would appreciate suggestions on how to best utilize the time.

Really just trying to have a well-rounded trip. Muchos gracias!