1- Open the gta3.img file with the IMG TOOL program
od_hotels1.txd
od_newscafe_dy.dff
od_newscafe_nt.dff
oceandrv.col
Delete the Files and Add New ones, i.e. Mod Files, to gta3.img

Add the dave_meble.dff file with the img tool

2- Delete the old "oceandrv" folder in the data\maps\oceandrv folder and add the new folder with the mod (oceandrv.col, oceandrv.IDE, oceandrv.IPL).


ATTENTION: Don't forget to backup the original unmodded files just in case.

EXTRA: The "dave_mable" file is a new file that is not in the game, so don't forget to add it.