There's another spot bear Pyrgos, but the best one is Kavala I think, you can get lock picks, zippies, cocaine, processed oil, gold and silver doubloon, silver piece, pearls, rubies and flawless diamonds. I will recomend going with an off road, load up till ful and sell everything. Jewels at the jewellery and oil at commodities trader. Each trip will give you around 20k. The only thing you may worries about is getting your car robbed, park it near the shore and put an alarm system on it so you listen if someone is trying to lock pick. Also I recommend having the talent point. With it, it takes you about 3-5 minutes to finish excavating so it doesn't get that boring. If you want more help don't hesitate on sending me a message.