+1 from me xD! Its a great ideea.
I suggested some drop offs placehttp://imgur.com/HheNE
The places are nice, but their is one little problem; some boats ( The tropic), what would be the shipping boat, can't sail under some bridges. so then you have to sail 5 minutes if you want to reach SF harbor to LS harbor...
since we cant change the original bridge of San Andreas,an easy way for that is to not use some of the suggested place OR,by changing the COLs of the tropic and/or other ship to fit the bridge.