Diplomacy,
Sorry to hear that your travel mate has backed out, isn't it annoying when that happens... It's also very daunting to travel alone anywhere, but once you start I'm sure you won't stop as it's lots of fun. India (If you haven't been before) can be a bit of a shock to the system, but if you just relax and don't worry about the little things it's such a nice place, cheap, friendly, safe... Goa especialy is very safe, more so than England anyway, you should be aware of the dogs which can be a pain, but I've not had a problem - just show them who's boss!
I will be in Goa in June although I will be returning to England for a 'holiday' for a few weeks but we do have lots of volunteers who are out here. Unfortunately most of the volunteers spend most their week teaching the children, but maybe some would be up for traveling at the weekend... A couple have just gone up to Mumbai this weekend for a little trip, you should also be aware that it will most probably started raining by then, so do bring something to keep you dry, preferably Gortex as when it rains it does have rain. Most of our volunteers are based around the Calangute Area and it's a good place to start as it easy (lots of things still open and quite busy), but traveling down to Palolim is also good, but not sure how muchwill be open. It depends what you want from your stay and how long you're staying....
All our contact details are on the link below (Children Walking Tall)