Walk out of your hotel and turn left. In a few minutes time you have Bilijo Monkey reserve on your left. Guides are available at the entrance.
Walk out of your hotel and turn right and in about 20-25 minutes you will meet the point were Kotu Creek meets the sea. Access to Kotu Village is through any of the hotels or the craft market which is beyond the river in about 2-300m. The area around Kotu bridge is excellent . on your way back go over the bridge, take the first turn on your right and keep on going. You will find the Casino Cycle track which eventually comes out at a road, Turn right and you drop back on to the beach at Solomons Beach Bar.
Here's my recent trip report to give you an idea of what you might see locally.
http://www.northwalesbirding.co.uk/forum/viewtopic.php?f=10&t=4922
A taxi to Tanji is recommended. Should cost about 600 dalasai. Watch the guides, they will try and hit you for a big score !!
Enjoy, cheers Dave