Depends what your after but Skegness water leisure park is our favourie tho it does get busy during school holidays. Skegness sands is another that usually gets favourable reports on here.
I have done a review on SWLP and it gives a few tips for the area even if you dont choose the park. Hope you enjoy, we love the area.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.