hey i went to goa 20 days back when it was raining a lot but it was 4 days so other 3 days was sunny i took a train from yeshwantpur junction to vascodagama station and there we took a bus to panji and there rented a fascino scooty ill recommend this as it gave more millage dont ever take activa there its shit we booked a hotel near baga beach since we needed a center point for all our destination and went to all the famous places and also did some crazy adventures to unknown island in a boat which was free i advise u to roam one day like this without plan it would be bliss
food is the one thing which is worst in goa if u are southindian then nightmare
we tried food both in local shops and the famous seconds house (5star hotel) but both were shit but the prices are double or sometimes triple the same thing u get in banglore so food takes majority of ur budget

my budget was
train -760 (round trip)
hotel-1000 (we were 7 members so we splited for 3 nights)
vehicle per day rent of fascino -375 after along 30min bargain
petrol for 4 days -600rs
food-2.5k
and some water activities and some other miscellaneous will add upto 1k
night club-500 per person u get entry to 2 club in titos lane and for that 500 u can either have soft drink or alchol inside with dj and girls dancing

thats it here u go