RE: Stake over the fire.
I too like olive oil (2 parts) as the base for marinating just about anything.
From there you can add (1 part) soy sauce or vinegar/balsamic vinegar or
worcestershire sauce (had to look up that spelling). Also your
favorite wine. Lemon, lime or fresh squeezed orange juice.
Then add your favorite spices. There are some good pre-mixed available.
Just don't leave out the fresh ground black pepper. Use your imagination and try it on beef, chicken, pork and fish. Get some vegetables in there too, change up the mix some (but again, olive oil is the best starter).
Mix it up and carry to camp site in zip-lock bags marinating all the way.
A gas grill is great for home, but nothing taste better than cooking over hard-wood coals.
PKnTX