The KWS site can organise boats to Central Island (KSh15,000), Sibiloi (KSh30,000) and South Island (KSh80,000). There is also a makeshift campsite on the grounds if you need to stay the night (KSh1000 per person).
If there was any out-of-the-way place to send a postcard, this is it. Your friends will be jealous! Though do note that Lodwar does not actually sell postcards, so a letter will have to do.
If you have a worst-case scenario, the police station is open 24 hours and the station commander speaks excellent English.
The local hospital has X-ray facilities and a pharmacy. It's not too busy, but don't expect it to be a quick visit.
Has an ATM and changes cash and travellers cheques.