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dictionary - ggplot map in R - title inside border and more space within border

I have some code written to make a map with USA states and territories. For some territories I need to draw a border outside the title, giving more space to the map. See below a chunk extracted for Hawaii, the grey border is the one that I have right now but I need something similar to the red border that I edited in paint (yes, very bad using paint I know). Any suggestions on how to solve this? I tried to move the border using panel.border without success. The most important task is to add the border giving more space to the plot.

map produced in ggplot and edited in paint

library("choroplethrMaps")

# **************************
# Shapefiles for Hawai
# **************************
data(state.map)

# Subset for Hawaii
map.HI.dat <- subset(map.dat, State=="HI" )
dim(map.HI.dat) #[1] 3  95
map.HI.freq <- data.frame(table(map.HI.dat$state.name))
colnames(map.HI.freq) <- c("region", "n")
class(map.HI.freq$region) #[1] "factor"
map.HI.freq$region <- as.character(map.HI.freq$region)
map.HI.freq$region[map.HI.freq$region=="hawai"] <- "hawaii"
#View(map.HI.freq)
hawaii.st <- subset(state.map, region=="hawaii")

map.HI.freq <- data.frame(region="hawaii",
                          n=4)

hawaii.map.dat <- plyr::join(hawaii.st, map.HI.freq, by="region")
hawaii.map.dat$brks <- cut(hawaii.map.dat$n,
                           breaks = c(0, 0.99, 5,10,50,max.breaks),
                           labels = c("0", "1 - 5", "6 - 50", "51 - 150", paste("151 - ",max.breaks,sep="")),
                           include.lowest = TRUE)

s2 <-ggplot() + 
  geom_polygon(data=hawaii.map.dat, aes(x=long, y=lat, group = group, fill=brks), colour="black", size=1, show.legend = FALSE) +
  scale_fill_manual(name="",
                    values = colors.for.maps, 
                    breaks = breaks.for.maps, 
                    drop = FALSE) +
  theme(panel.grid       = element_blank(),
        panel.border     = element_rect(colour = "grey50", size = 2, fill=NA),
        panel.background = element_blank(),
        plot.title       = element_text(colour="black", size = 14, face = "bold", hjust=0.5)) + 
  labs(fill  = "Frequencies",
       title = "Hawaii", x="", y="") + 
  scale_y_continuous(breaks=c()) + 
  scale_x_continuous(breaks=c()) + 
  coord_map() 
s2


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You can set the plot.background to be a rectangle and then remove your panel.border:

library("choroplethrMaps")

# **************************
# Shapefiles for Hawai
# **************************
data(state.map)

# Subset for Hawaii
hawaii.st <- subset(state.map, region=="hawaii")

ggplot(hawaii.st) +
    geom_polygon(aes(long, lat, group = group)) +
    theme(panel.grid       = element_blank(),
          panel.background = element_blank(),
          plot.background = element_rect(fill = "white", color = "grey20",size = 2),
          plot.title       = element_text(colour="black", size = 14, face = "bold", hjust=0.5)) + 
    labs(title = "Hawaii", x="", y="") + 
    scale_y_continuous(breaks=c()) + 
    scale_x_continuous(breaks=c()) + 
    coord_map()

enter image description here


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