I would use timevault to pass the things you don't want to do.... will take you 5 minutes to create that save.
Timevault is a mission passer code tool-- http://www.gtaforums...howtopic=397970
(located near the bottom of the first post).
To use do the following.
Go into your VC game files--- find the main.scm file...... rename it anything--- I usually just call it "mainorig.scm"
Download the timevault main.scm file and put it in the same folder as above.
Rename it "main.scm"
Thats it.... start your game and any mission you start will be instantly passed.... I forget how the R3 missions work exactly-- I don't recall if you just get in the R3 vehicle or if you have to "start" the R3 mission to get it to work.
To return the game back to normal play, just switch the file names back.
You will need to use molotovs to get the firetruck to show up as there are no fixed spawn locations on the first island for the fire truck-- there are no molotovs weapon spawns on the first island but the rampage at the south end of ocean beach is a molotov rampage-- start that one and throw some molotovs to get the fire truck to show up... be careful as molotov killing sprees will really raise your wanted level... you may want to pass that one as completing the rampage will clear any wanted stars you will obtain.