recommendations on 1st boat

I was referred to this site by a member on "the hull truth" website. My 2 children ages 9 & 12 have been pushing me to get a boat. I basically know nothing about boats, except charter fishing trips. I am asking for your recommendations/opinions. The boat will be used in the inter-coastal waterways near Cape May NJ + very light ocean. I really like the layout of the open console boats. Boat will be used for fishing, tubing,cruising etc. Would like to keep the boat at 20' or under, large enough??? Also very limited budget, 5k or lower. Any thoughts. Thanks.

Tom