I was in the Gambia for 2 weeks in March 2001 and did not see any razor wire as for guards they are only there to stop the 'bumpsters' from ripping off the tourists,as they will if anyone is stupid enough to believe them.
I stayed at The Atlantic Hotel in Banjul has its own bird gardens, though the beach is small as it is eroding.The Pama Rima in Kololi is suppose to be good and has a better beach.
If you really want to check out the Bird Safari Camp though there is no beach but you do get to stay in a hut a great experience I can assure you but one night was enough for me.